Free Thyroxine (T4)
Females, Age 70+
The median free T4 for females aged 70+ in the US population is 0.84 ng/dL, with 90% of this group falling between 0.61 and 1.11 ng/dL.
NHANES 2009-2012 Thyroid Profile (Subsample A) 2009-2012 · Sample size: 212 participants · Unit: ng/dL
Percentile Distribution
| Percentile | P5 | P25 | P50 | P75 | P95 |
|---|---|---|---|---|---|
| Value (ng/dL) | 0.6 | 0.7 | 0.8 | 0.9 | 1.1 |
0.6 0.7 0.8 0.9 1.1
P5 P25 P50 P75 P95
Data and Methodology
- Dataset
- NHANES 2009-2012 Thyroid Profile (Subsample A) ( NHANES 2009–2012 Thyroid 2009 , Survey-weighted percentiles from NHANES 2009-2012 Thyroid Profile Subsample A)
- Survey years
- 2009-2012
- Sample size
- 212 participants
- Reference population
- US adults aged 20+, excluding pregnant participants, those with self-reported thyroid disease, and current thyroid medication users
- Exclusion criteria
-
- Age under 20
- Pregnant at time of exam (RIDEXPRG == 1)
- Self-reported thyroid disease (MCQ160M == 1)
- Current thyroid medication use (RXDDRUG match against thyroid_drug_list.txt)
- Missing analyte value
- Missing or zero subsample weight (WTSA2YR)