TABLE 1.
Demographic characteristics and biomarker measurements by study sample1
| Complete sample | Hair subset | Segmental hair subset | |
|---|---|---|---|
| n | 68 | 58 | 18 |
| Sex, % female | 49 | 52 | 892 |
| Age, y | 41 ± 18 | 41 ± 17 | 49 ± 122 |
| 14–19, % | 16 | 12 | 0 |
| 20–39, % | 32 | 34 | 28 |
| 40–59, % | 40 | 41 | 61 |
| ≥60, % | 12 | 12 | 11 |
| BMI, kg/m2 | 27.2 ± 6.3 | 27.4 ± 6.3 | 30.8 ± 6.92 |
| <18.5, % | 1 | 0 | 0 |
| ≥18.5 to ≤25, % | 44 | 41 | 22 |
| >25 to ≤30, % | 24 | 29 | 11 |
| >30 kg/m2, % | 31 | 29 | 67 |
| Stable isotope ratios | |||
| RBC NIR, ‰ | 9.3 ± 1.8 (6.3, 13.5) | 9.3 ± 1.8 (6.3, 13.5) | 10.4 ± 1.62 (7.8, 13.5) |
| Hair NIR, ‰ | — | 10.8 ± 2.0 (6.9, 15.2) | 12.0 ± 1.92 (8.2, 15.2) |
1
Values are percentages, mean ± SD, or ranges (min, max). NIR, nitrogen isotope ratio, expressed as δ15N values.
2
Differs from complete sample and hair subset, P < 0.05 (t test or chi-square test).