NHANES Variable History Report

RIAGENDRCompatible

Gender of the sample person

Observed years: 1999–2023
Release records: 39
Datasets: 39
Components: Demographics · Laboratory

Qualified Praxis harmonization assessment

Compatible · high confidence

CDC/NCHS releases RIAGENDR consistently as the same two-category demographic variable across Continuous NHANES, with code 1 for Male and code 2 for Female. Indexed DEMO-file method, target, and weight changes do not by themselves establish a change in the variable's released coding or longitudinal construct.

Evidence provenance: CDC/NCHS source-confirmed evidence · Praxis deterministic adjudication

Praxis harmonization actions

Pool the released RIAGENDR categories directly across calibrated cycles. Apply cycle-appropriate NHANES survey weights and design variables separately, and do not reinterpret RIAGENDR as a gender-identity measure beyond the released CDC/NCHS coding.

Supporting CDC/NCHS evidence

Supporting source-evidence notes

CDC/NCHS notes mention these survey or subsample weight variables across the indexed releases: WTINT2YR, WTINT4YR, WTMEC2YR, WTMEC4YR, WTSMSMPA, WTBSMSMA, WTINTPRP, WTMECPRP. Do not apply them together; choose the cycle- and subsample-appropriate weight for the releases included in the analysis. Eligibility/target wording changes across releases; apply cycle-specific eligibility before pooling. A source-supported method/instrument change is flagged below; do not assume direct cross-cycle measurement equivalence.

These notes summarize indexed evidence and method-text signals. They do not supersede the qualified harmonization assessment above.

Documented weight variables: WTINT2YR · WTINT4YR · WTMEC2YR · WTMEC4YR · WTSMSMPA · WTBSMSMA · WTINTPRP · WTMECPRP
Units observed: Not stated / categorical
Enriched releases: 39
Method-change status: confirmed method change

Method-change assessment

Confirmed method/instrument change detected

One or more method/instrument change points are supported by captured CDC/NCHS wording. Do not assume raw cross-cycle equivalence; apply documented correction/calibration guidance where available or preserve method periods analytically.

Releases with method evidence: 27
Flagged method boundaries: 26
Assessment status: Confirmed method/instrument change detected
Inference rule: Documentation differences ≠ confirmed method changes

Method / instrument change points and harmonization actions

2001-2002 → 2001-2002: Documentation changed — method change not yet confirmed · Evidence: automated documentation comparison. The captured CDC/NCHS method documentation differs from the preceding enriched release. Praxis does not treat a text difference alone as proof that the scientific method changed.
Harmonization action: Review the linked source documents before pooling across this boundary. Until a substantive method/instrument change is confirmed, classify this as documentation variation rather than a scientific discontinuity. Review source
2001-2002 → 2001-2002: Documentation changed — method change not yet confirmed · Evidence: automated documentation comparison. The captured CDC/NCHS method documentation differs from the preceding enriched release. Praxis does not treat a text difference alone as proof that the scientific method changed.
Harmonization action: Review the linked source documents before pooling across this boundary. Until a substantive method/instrument change is confirmed, classify this as documentation variation rather than a scientific discontinuity. Review source
2001-2002 → 2005-2006: Documentation changed — method change not yet confirmed · Evidence: automated documentation comparison. The captured CDC/NCHS method documentation differs from the preceding enriched release. Praxis does not treat a text difference alone as proof that the scientific method changed.
Harmonization action: Review the linked source documents before pooling across this boundary. Until a substantive method/instrument change is confirmed, classify this as documentation variation rather than a scientific discontinuity. Review source
2005-2006 → 2005-2006: Source-supported method change · Evidence: CDC/NCHS source wording. The 17 PCDDs/PCDFs, and four cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et al., 1990 and Turner et al., 1994. The method for PCBs is described in Sjodin et al., 2004 and Barr et al., 2003. Refer to the Laboratory Method Files section for a detailed description of the laborator…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source
2005-2006 → 2005-2006: Documentation changed — method change not yet confirmed · Evidence: automated documentation comparison. The captured CDC/NCHS method documentation differs from the preceding enriched release. Praxis does not treat a text difference alone as proof that the scientific method changed.
Harmonization action: Review the linked source documents before pooling across this boundary. Until a substantive method/instrument change is confirmed, classify this as documentation variation rather than a scientific discontinuity. Review source
2005-2006 → 2005-2006: Documentation changed — method change not yet confirmed · Evidence: automated documentation comparison. The captured CDC/NCHS method documentation differs from the preceding enriched release. Praxis does not treat a text difference alone as proof that the scientific method changed.
Harmonization action: Review the linked source documents before pooling across this boundary. Until a substantive method/instrument change is confirmed, classify this as documentation variation rather than a scientific discontinuity. Review source
2005-2006 → 2007-2008: Documentation changed — method change not yet confirmed · Evidence: automated documentation comparison. The captured CDC/NCHS method documentation differs from the preceding enriched release. Praxis does not treat a text difference alone as proof that the scientific method changed.
Harmonization action: Review the linked source documents before pooling across this boundary. Until a substantive method/instrument change is confirmed, classify this as documentation variation rather than a scientific discontinuity. Review source
2007-2008 → 2007-2008: Source-supported method change · Evidence: CDC/NCHS source wording. The seventeen PCDDs/PCDFs, and four cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et al., 1990 and Turner et al., 1994. The method for PCBs is described in Sjodin et al., 2004 and Barr et al., 2003. Refer to the Laboratory Method Files section for a detailed description of the la…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source
2007-2008 → 2007-2008: Documentation changed — method change not yet confirmed · Evidence: automated documentation comparison. The captured CDC/NCHS method documentation differs from the preceding enriched release. Praxis does not treat a text difference alone as proof that the scientific method changed.
Harmonization action: Review the linked source documents before pooling across this boundary. Until a substantive method/instrument change is confirmed, classify this as documentation variation rather than a scientific discontinuity. Review source
2007-2008 → 2007-2008: Documentation changed — method change not yet confirmed · Evidence: automated documentation comparison. The captured CDC/NCHS method documentation differs from the preceding enriched release. Praxis does not treat a text difference alone as proof that the scientific method changed.
Harmonization action: Review the linked source documents before pooling across this boundary. Until a substantive method/instrument change is confirmed, classify this as documentation variation rather than a scientific discontinuity. Review source
2007-2008 → 2009-2010: Source-supported method change · Evidence: CDC/NCHS source wording. Serum samples from NHANES 2009-2010 were stored frozen before analysis. Eleven polybrominated diphenyl ethers (PBDEs) and PBB-153 were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source
2009-2010 → 2009-2010: Source-supported method change · Evidence: CDC/NCHS source wording. The seventeen PCDDs/PCDFs, and three cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et al., 1992 and Turner et al., 1994. Reported results met the Division of Laboratory Sciences’ quality control and quality assurance performance criteria for accuracy and precision (similar to spe…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source
2009-2010 → 2009-2010: Source-supported method change · Evidence: CDC/NCHS source wording. Serum samples from NHANES 2009-2010 were stored frozen before analysis. Twenty nine non-dioxin-like polychlorinated biphenyls were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et …
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source
2009-2010 → 2009-2010: Source-supported method change · Evidence: CDC/NCHS source wording. Serum samples from NHANES 2009-2010 were stored frozen before analysis. Eight organochlorine pesticides and metabolites were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 20…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source
2009-2010 → 2011-2012: Source-supported method change · Evidence: CDC/NCHS source wording. Serum samples from NHANES 2011-2012 were stored frozen before analysis. Eleven polybrominated diphenyl ethers (PBDEs) and PBB-153 were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source
2011-2012 → 2011-2012: Source-supported method change · Evidence: CDC/NCHS source wording. The seventeen PCDDs/PCDFs, and three cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et. al., 1992 and Turner et. al., 1994. Reported results met the Division of Laboratory Sciences’ quality control and quality assurance performance criteria for accuracy and precision (similar to s…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source
2011-2012 → 2011-2012: Source-supported method change · Evidence: CDC/NCHS source wording. Serum samples from NHANES 2011-2012 were stored frozen before analysis. Twenty-nine non-dioxin-like polychlorinated biphenyls were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et …
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source
2011-2012 → 2011-2012: Source-supported method change · Evidence: CDC/NCHS source wording. Serum samples from NHANES 2011-2012 were stored frozen before analysis. Eight organochlorine pesticides and metabolites were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 20…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source
2011-2012 → 2013-2014: Source-supported method change · Evidence: CDC/NCHS source wording. Serum samples from NHANES 2013-2014 were stored frozen before analysis. Eleven polybrominated diphenyl ethers (PBDEs) and PBB-153 were measured in serum using automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al., 2012…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source
2013-2014 → 2013-2014: Source-supported method change · Evidence: CDC/NCHS source wording. The seventeen PCDDs/PCDFs, and three cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et. al., 1992 and Turner et. al., 1994. Refer to the Laboratory Method Files for a detailed description of the laboratory methods used. There were no changes to the lab method, lab equipment, or la…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source
2013-2014 → 2013-2014: Source-supported method change · Evidence: CDC/NCHS source wording. Serum samples from NHANES 2013-2014 were stored frozen before analysis. Twenty-nine non-dioxin-like polychlorinated biphenyls were measured in serum using automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al., 2012, wh…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source
2013-2014 → 2013-2014: Documentation changed — method change not yet confirmed · Evidence: automated documentation comparison. The captured CDC/NCHS method documentation differs from the preceding enriched release. Praxis does not treat a text difference alone as proof that the scientific method changed.
Harmonization action: Review the linked source documents before pooling across this boundary. Until a substantive method/instrument change is confirmed, classify this as documentation variation rather than a scientific discontinuity. Review source
2013-2014 → 2015-2016: Source-supported method change · Evidence: CDC/NCHS source wording. Serum samples from NHANES 2015-2016 were stored frozen before analysis. Eleven polybrominated diphenyl ethers (PBDEs) and PBB-153 (Table 1) were measured in serum using automated liquid-liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source
2015-2016 → 2015-2016: Source-supported method change · Evidence: CDC/NCHS source wording. The seventeen PCDDs/PCDFs, and three cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et. al., 1992 and Turner et. al., 1994. Refer to the Laboratory Method Files for a detailed description of the laboratory methods used. There were no changes to the lab method, lab equipment, or la…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source
2015-2016 → 2015-2016: Source-supported method change · Evidence: CDC/NCHS source wording. Serum specimens from NHANES 2015-2016 were stored frozen before analysis. Twenty-four non-dioxin-like polychlorinated biphenyls (Table 1) were measured in serum using automated liquid-liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et a…
Harmonization action: Treat this as a methodological change point. Review CDC/NCHS comparability guidance and any calibration or correction equations before pooling; if equivalence is not established, stratify by method period or run sensitivity analyses. Review source
2015-2016 → 2015-2016: Documentation changed — method change not yet confirmed · Evidence: automated documentation comparison. The captured CDC/NCHS method documentation differs from the preceding enriched release. Praxis does not treat a text difference alone as proof that the scientific method changed.
Harmonization action: Review the linked source documents before pooling across this boundary. Until a substantive method/instrument change is confirmed, classify this as documentation variation rather than a scientific discontinuity. Review source

Cycle-by-cycle method chronology

2001-2002: SSBFR_B — Serum samples from NHANES 2001-2002 were stored frozen before analysis. Nine polybrominated diphenyl ethers (PBDEs) and PBB-153 were measured in serum through the use of automated solid phase extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described by Sjodin et al., 2004.
2001-2002: SSPCB_B — Twenty nine non-dioxin-like polychlorinated biphenyls were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCBs is described in Sjodin et al., 2004 and Barr et al., 2003. Reported results met the Division of Laboratory Sciences’ quality control and quality assurance performance criteria for accuracy and precision (similar to specifications outlined by Westgard, 1981).
2001-2002: SSPST_B — Nine organochlorine pesticides and metabolites were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for organochlorine pesticides is described in Sjodin et al., 2004 and Barr et al., 2003. Reported results met the Division of Laboratory Sciences’ quality control and quality assurance performance criteria for accuracy and precision (similar to specifications outlined by Westgard, 1981).
2005-2006: BFRPOL_D — Eleven polybrominated diphenyl ethers (PBDEs) and PBB-153 were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes wasperformed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., 2004. Refer to the Laboratory Methods Files section for a detailed descri…
2005-2006: DOXPOL_D — The 17 PCDDs/PCDFs, and four cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et al., 1990 and Turner et al., 1994. The method for PCBs is described in Sjodin et al., 2004 and Barr et al., 2003. Refer to the Laboratory Method Files section for a detailed description of the laboratory methods used. There were no changes to the lab method, lab equipment, or lab s…
2005-2006: PCBPOL_D — Twenty-nine non-dioxin-like PCBs and eight mono-ortho-substituted PCBs were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., 2004 and Barr et al., 2003. Refer to the Laboratory Methods…
2005-2006: PSTPOL_D — Eight organochlorine pesticides and metabolites were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., 2004 and Barr et al., 2003. Refer to the Laboratory Methods Files section for a de…
2007-2008: BFRPOL_E — Eleven polybrominated diphenyl ethers (PBDEs) and PBB-153 were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., 2004. Refer to the Laboratory Methods Files section for a detailed descr…
2007-2008: DOXPOL_E — The seventeen PCDDs/PCDFs, and four cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et al., 1990 and Turner et al., 1994. The method for PCBs is described in Sjodin et al., 2004 and Barr et al., 2003. Refer to the Laboratory Method Files section for a detailed description of the laboratory methods used. There were no changes to the lab method, lab equipment, o…
2007-2008: PCBPOL_E — Twenty-nine non-dioxin-like polychlorinated biphenyls were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., 2004 and Barr et al., 2003 Refer to the Laboratory Methods Files section for…
2007-2008: PSTPOL_E — Eight organochlorine pesticides and metabolites were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., 2004 and Barr et al., 2003. Refer to the Laboratory Methods Files section for a de…
2009-2010: BFRPOL_F — Serum samples from NHANES 2009-2010 were stored frozen before analysis. Eleven polybrominated diphenyl ethers (PBDEs) and PBB-153 were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., …
2009-2010: DOXPOL_F — The seventeen PCDDs/PCDFs, and three cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et al., 1992 and Turner et al., 1994. Reported results met the Division of Laboratory Sciences’ quality control and quality assurance performance criteria for accuracy and precision (similar to specifications outlined by Westgard, 1981). Refer to the Laboratory Method Files fo…
2009-2010: PCBPOL_F — Serum samples from NHANES 2009-2010 were stored frozen before analysis. Twenty nine non-dioxin-like polychlorinated biphenyls were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., 2004…
2009-2010: PSTPOL_F — Serum samples from NHANES 2009-2010 were stored frozen before analysis. Eight organochlorine pesticides and metabolites were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., 2004. Refe…
2011-2012: BFRPOL_G — Serum samples from NHANES 2011-2012 were stored frozen before analysis. Eleven polybrominated diphenyl ethers (PBDEs) and PBB-153 were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., …
2011-2012: DOXPOL_G — The seventeen PCDDs/PCDFs, and three cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et. al., 1992 and Turner et. al., 1994. Reported results met the Division of Laboratory Sciences’ quality control and quality assurance performance criteria for accuracy and precision (similar to specifications outlined by Westgard, 1981). Refer to the Laboratory Method Files …
2011-2012: PCBPOL_G — Serum samples from NHANES 2011-2012 were stored frozen before analysis. Twenty-nine non-dioxin-like polychlorinated biphenyls were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., 2004…
2011-2012: PSTPOL_G — Serum samples from NHANES 2011-2012 were stored frozen before analysis. Eight organochlorine pesticides and metabolites were measured in serum through the use of automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al, 2012, which is a modification of the method described by Sjodin et al., 2004. Refe…
2013-2014: BFRPOL_H — Serum samples from NHANES 2013-2014 were stored frozen before analysis. Eleven polybrominated diphenyl ethers (PBDEs) and PBB-153 were measured in serum using automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al., 2012, which is a modification of the method described by Sjodin et al., 2004. Refer …
2013-2014: DOXPOL_H — The seventeen PCDDs/PCDFs, and three cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et. al., 1992 and Turner et. al., 1994. Refer to the Laboratory Method Files for a detailed description of the laboratory methods used. There were no changes to the lab method, lab equipment, or lab site for this component in the NHANES 2013-2014 cycle.
2013-2014: PCBPOL_H — Serum samples from NHANES 2013-2014 were stored frozen before analysis. Twenty-nine non-dioxin-like polychlorinated biphenyls were measured in serum using automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al., 2012, which is a modification of the method described by Sjodin et al., 2004. Refer to t…
2013-2014: PSTPOL_H — Serum samples from NHANES 2013-2014 were stored frozen before analysis. Eight organochlorine pesticides and metabolites were measured in serum using automated liquid/liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al., 2012, which is a modification of the method described by Sjodin et al., 2004. Refer to the Lab…
2015-2016: BFRPOL_I — Serum samples from NHANES 2015-2016 were stored frozen before analysis. Eleven polybrominated diphenyl ethers (PBDEs) and PBB-153 (Table 1) were measured in serum using automated liquid-liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al., 2012, which is a modification of the method described by Sjodin et al., 20…
2015-2016: DOXPOL_I — The seventeen PCDDs/PCDFs, and three cPCBs were measured in serum by gas chromatography/isotope-dilution high-resolution mass spectrometry (GC/ID-HRMS). The analytical method for PCDDs/PCDFs/cPCB is described in Patterson et. al., 1992 and Turner et. al., 1994. Refer to the Laboratory Method Files for a detailed description of the laboratory methods used. There were no changes to the lab method, lab equipment, or lab site for this component in the NHANES 2015-2016 cycle.
2015-2016: PCBPOL_I — Serum specimens from NHANES 2015-2016 were stored frozen before analysis. Twenty-four non-dioxin-like polychlorinated biphenyls (Table 1) were measured in serum using automated liquid-liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al., 2012, which is a modification of the method described by Sjodin et al., 2004…
2015-2016: PSTPOL_I — Serum samples from NHANES 2015-2016 were stored frozen before analysis. Eight organochlorine pesticides and metabolites (Table 1) were measured in serum using automated liquid-liquid extraction and subsequent sample clean-up. Final determination of target analytes was performed by isotope dilution gas chromatography high-resolution mass spectrometry GC/IDHRMS. The analytical method is described in Jones et al., 2012, which is a modification of the method described by Sjodin et al., 2004. Refer …

Praxis-enriched cycle evidence

1999-2000: DEMO · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTINT4YR, WTMEC2YR, WTMEC4YR
2001-2002: DEMO_B · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTINT4YR, WTMEC2YR, WTMEC4YR
2001-2002: SSBFR_B · Target: Both males and females 3 YEARS - 150 YEARS · Method evidence captured
2001-2002: SSPCB_B · Target: Both males and females 3 YEARS - 150 YEARS · Method evidence captured
2001-2002: SSPST_B · Target: Both males and females 3 YEARS - 150 YEARS · Method evidence captured
2003-2004: DEMO_C · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
2005-2006: DEMO_D · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
2005-2006: BFRPOL_D · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Design: SDMVSTRA + SDMVPSU · Method evidence captured
2005-2006: DOXPOL_D · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Design: SDMVSTRA + SDMVPSU · Method evidence captured
2005-2006: PCBPOL_D · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Method evidence captured
2005-2006: PSTPOL_D · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Method evidence captured
2007-2008: DEMO_E · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
2007-2008: BFRPOL_E · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Design: SDMVSTRA + SDMVPSU · Method evidence captured
2007-2008: DOXPOL_E · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Design: SDMVSTRA + SDMVPSU · Method evidence captured
2007-2008: PCBPOL_E · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Method evidence captured
2007-2008: PSTPOL_E · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Method evidence captured
2009-2010: DEMO_F · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
2009-2010: BFRPOL_F · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Method evidence captured
2009-2010: DOXPOL_F · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Method evidence captured
2009-2010: PCBPOL_F · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Method evidence captured
2009-2010: PSTPOL_F · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Method evidence captured
2011-2012: DEMO_G · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
2011-2012: BFRPOL_G · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Design: SDMVSTRA + SDMVPSU · Method evidence captured
2011-2012: DOXPOL_G · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Method evidence captured
2011-2012: PCBPOL_G · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Method evidence captured
2011-2012: PSTPOL_G · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTSMSMPA · Design: SDMVSTRA + SDMVPSU · Method evidence captured
2013-2014: DEMO_H · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
2013-2014: BFRPOL_H · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTBSMSMA · Design: SDMVSTRA + SDMVPSU · Method evidence captured
2013-2014: DOXPOL_H · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTBSMSMA · Method evidence captured
2013-2014: PCBPOL_H · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTBSMSMA · Method evidence captured
2013-2014: PSTPOL_H · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTBSMSMA · Design: SDMVSTRA + SDMVPSU · Method evidence captured
2015-2016: DEMO_I · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
2015-2016: BFRPOL_I · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTBSMSMA · Design: SDMVSTRA + SDMVPSU · Method evidence captured
2015-2016: DOXPOL_I · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTBSMSMA · Method evidence captured
2015-2016: PCBPOL_I · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTBSMSMA · Method evidence captured
2015-2016: PSTPOL_I · Target: Both males and females 12 YEARS - 150 YEARS · Weight evidence: WTBSMSMA · Design: SDMVSTRA + SDMVPSU · Method evidence captured
2017-2018: DEMO_J · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR
2017-2020: P_DEMO · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINTPRP, WTMECPRP
2021-2023: DEMO_L · Target: Both males and females 0 YEARS - 150 YEARS · Weight evidence: WTINT2YR, WTMEC2YR

Variable names / labels over time

Gender of the sample person — 1999-2000 · 2001-2002 · 2003-2004 · 2005-2006 · 2007-2008 · 2009-2010
Gender — 2001-2002 · 2005-2006 · 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016
Gender of the participant. — 2011-2012 · 2013-2014 · 2015-2016 · 2017-2018 · 2017-2020 · 2021-2023

Cycle-by-cycle release history

1999-2000: DEMO — Gender of the sample person — Demographic Variables & Sample Weights (Demographics)
2001-2002: DEMO_B — Gender of the sample person — Demographic Variables & Sample Weights (Demographics)
2001-2002: SSBFR_B — Gender — Brominated Flame Retardants (BFRs) - Pooled Samples (Surplus) (Laboratory)
2001-2002: SSPCB_B — Gender — Non-dioxin-like Polychlorinated Biphenyls - Pooled Samples (Surplus Sera) (Laboratory)
2001-2002: SSPST_B — Gender — Pesticides - Organochlorine Metabolites - Serum - Pooled Samples (Surplus) (Laboratory)
2003-2004: DEMO_C — Gender of the sample person — Demographic Variables & Sample Weights (Demographics)
2005-2006: BFRPOL_D — Gender — Brominated Flame Retardants (BFRs) - Pooled Samples (Laboratory)
2005-2006: DEMO_D — Gender of the sample person — Demographic Variables & Sample Weights (Demographics)
2005-2006: DOXPOL_D — Gender — Polychlorinated dibenzo-p-dioxins (PCDDs), Dibenzofurans (PCDFs) & Coplanar Polychlorinated Biphenyls (cPCBs) - Pooled Samples (Laboratory)
2005-2006: PCBPOL_D — Gender — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
2005-2006: PSTPOL_D — Gender — Pesticides - Organochlorine Pesticides - Pooled Samples (Laboratory)
2007-2008: BFRPOL_E — Gender — Brominated Flame Retardants (BFRs) - Pooled Samples (Laboratory)
2007-2008: DEMO_E — Gender of the sample person — Demographic Variables & Sample Weights (Demographics)
2007-2008: DOXPOL_E — Gender — Polychlorinated dibenzo-p-dioxins (PCDDs), Dibenzofurans (PCDFs) & Coplanar Polychlorinated Biphenyls (cPCBs) - Pooled Samples (Laboratory)
2007-2008: PCBPOL_E — Gender — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
2007-2008: PSTPOL_E — Gender — Pesticides - Organochlorine Pesticides - Pooled Samples (Laboratory)
2009-2010: BFRPOL_F — Gender — Brominated Flame Retardants (BFRs) - Pooled Samples (Laboratory)
2009-2010: DEMO_F — Gender of the sample person — Demographic Variables & Sample Weights (Demographics)
2009-2010: DOXPOL_F — Gender — Polychlorinated dibenzo-p-dioxins (PCDDs), Dibenzofurans (PCDFs) & Coplanar Polychlorinated Biphenyls (cPCBs) - Pooled Samples (Laboratory)
2009-2010: PCBPOL_F — Gender — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
2009-2010: PSTPOL_F — Gender — Pesticides - Organochlorine Pesticides - Pooled Samples (Laboratory)
2011-2012: BFRPOL_G — Gender — Brominated Flame Retardants (BFRs) - Pooled Samples (Laboratory)
2011-2012: DEMO_G — Gender of the participant. — Demographic Variables & Sample Weights (Demographics)
2011-2012: DOXPOL_G — Gender — Polychlorinated dibenzo-p-dioxins (PCDDs), Dibenzofurans (PCDFs) & Coplanar Polychlorinated Biphenyls (cPCBs) - Pooled Samples (Laboratory)
2011-2012: PCBPOL_G — Gender — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
2011-2012: PSTPOL_G — Gender — Pesticides - Organochlorine Pesticides - Pooled Samples (Laboratory)
2013-2014: BFRPOL_H — Gender — Brominated Flame Retardants (BFRs) - Pooled Samples (Laboratory)
2013-2014: DEMO_H — Gender of the participant. — Demographic Variables and Sample Weights (Demographics)
2013-2014: DOXPOL_H — Gender — Polychlorinated dibenzo-p-dioxins (PCDDs), Dibenzofurans (PCDFs) & Coplanar Polychlorinated Biphenyls (cPCBs) - Pooled Samples (Laboratory)
2013-2014: PCBPOL_H — Gender — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Serum - Pooled Samples (Laboratory)
2013-2014: PSTPOL_H — Gender — Pesticides - Organochlorine Pesticides - Pooled Samples (Laboratory)
2015-2016: BFRPOL_I — Gender — Brominated Flame Retardants (BFRs) - Pooled Samples (Laboratory)
2015-2016: DEMO_I — Gender of the participant. — Demographic Variables and Sample Weights (Demographics)
2015-2016: DOXPOL_I — Gender — Polychlorinated dibenzo-p-dioxins (PCDDs), Dibenzofurans (PCDFs) & Coplanar Polychlorinated Biphenyls (cPCBs) - Pooled Samples (Laboratory)
2015-2016: PCBPOL_I — Gender — Non-dioxin-like Polychlorinated Biphenyls & Mono-ortho-substituted Polychlorinated Biphenyls - Pooled Samples (Laboratory)
2015-2016: PSTPOL_I — Gender — Pesticides - Organochlorine Pesticides - Pooled Samples (Laboratory)
2017-2018: DEMO_J — Gender of the participant. — Demographic Variables and Sample Weights (Demographics)
2017-2020: P_DEMO — Gender of the participant. — Demographic Variables and Sample Weights (Demographics)
2021-2023: DEMO_L — Gender of the participant. — Demographic Variables and Sample Weights (Demographics)

Variable history and harmonization report.

Results for “RIAGENDR”

0 label-stable codes

Qualified assessment is authoritative; chronology remains supporting evidence.

Qualified harmonization assessment and indexed evidence

Gender of the sample person