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Representative study 001

Hemoglobin patterns by sex and age, 2015–2018

How does measured hemoglobin vary by sex and age among examined NHANES participants across the 2015–2016 and 2017–2018 survey cycles?

Released records17,531

Combined from four official CDC source files

Analysis eligible15,645

Examined participants with released hemoglobin

Weighted mean14.00

g/dL · 95% CI 13.93–14.06

Survey cycles2

2015–2016 and 2017–2018

Preliminary pattern

Weighted means separate after childhood.

The male and female estimates are nearly identical at ages 1–11. In this descriptive analysis, the male mean rises more sharply from adolescence and peaks at ages 20–39.

Male weighted mean14.73 g/dL
Female weighted mean13.29 g/dL
Survey-weighted mean hemoglobin by sex and ageMale and female estimates are about 12.8 grams per deciliter at ages 1 to 11. Male estimates rise to 14.8 at ages 12 to 19, peak at 15.3 at ages 20 to 39, and decline to 14.6 at age 60 and over. Female estimates range from 13.2 to 13.5 after childhood.1213141516Mean hemoglobin (g/dL)1–1112–1920–3940–5960+Age group (years)

Survey-weighted descriptive estimates using the NHANES examination weight, strata and PSU fields. Values are rounded to two decimals.

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01

Analysis-ready data

The validated participant-level dataset in three practical formats.

  • analytic.csv
  • analytic.parquet
  • analytic.xlsx
02

Full interpretation

Complete estimates, uncertainty, limitations and methods—not only highlights.

  • analytical-report.pdf
  • codebook.csv
  • harmonization.md
03

Source evidence

The exact CDC/NCHS inputs with canonical links and file checksums.

  • 4 original XPT files
  • manifest.json
  • SHA-256 checksums
04

Reproducibility

A transparent specification and starter code for rerunning the work.

  • analysis-specification.json
  • starter.R
  • starter.py
  • README.md
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