ADfdsec
Indexed NHANES variable
Questionnaire
Adult food security category for last 12 months
- Source releases
- 2
- Available cycles
- 1999-2000 · 2001-2002
- Dataset
- Food Security
Praxis Data Lab · Study Builder
Build your NHANES study with harmonization intelligence.
Combine variables from the indexed Continuous NHANES catalog, choose the cycles you need, and see how Praxis connects source history, methods, cycle boundaries, and cross-code lineage into a study-specific harmonization view.
3variables selected
Praxis identified a method boundary to address
Praxis found a material transition in the selected span and has identified the affected variables so the study can apply the appropriate adjustment.
3 variable assessments
ARXO2WD
Evidence developinglow confidence
Examination
OCCIPUT-TO-WALL DISTANCE IN CENTIMETERS
- Source releases
- 1
- Available cycles
- 2009-2010
- Dataset
- Arthritis Body Measures
No normalized longitudinal change evidence is available for this variable. Absence of events must not be interpreted as proof of cross-cycle equivalence.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
GTDCODE
Adjustment requiredhigh confidence
Laboratory
Incomplete OGTT Comment Code
- Source releases
- 5
- Available cycles
- 2007-2008 · 2009-2010 · 2011-2012 · 2013-2014 · 2015-2016
- Dataset
- Oral Glucose Tolerance Test
A methodological discontinuity falls inside the selected cycle span. Naive pooling of raw values across the flagged boundary is not recommended unless CDC/NCHS provides a defensible calibration or comparability procedure.
Evidence provenance: Praxis automated inference from indexed CDC/NCHS evidence
Evidence signals: source-derived · automated-difference · source-stated
Relevant boundaries: 2007-2008 → 2009-2010 · 2009-2010 → 2011-2012 · 2011-2012 → 2013-2014 · 2013-2014 → 2015-2016
Praxis harmonization actions
- Verify merge grain, companion variables, and component-specific analytic guidance for the new file context.
- Review the adjacent codebooks/methods. Keep this boundary as documentation variation unless source evidence confirms a substantive method or instrument change.
- Select the weight appropriate to each cycle and subsample; when pooling cycles, construct the combined weight according to NHANES guidance rather than reusing a single-cycle weight unchanged.
- Apply CDC/NCHS comparability or calibration guidance where available. If equivalence is not established, preserve separate method periods or perform sensitivity analyses rather than naively pooling raw values.