TABLE 1.
Characteristics of subjects by sex1
| Boys (n = 3434) | Girls (n = 3432) | |
| Age (y) | 12 (8, 16)2 | 12 (8, 16) |
| Black (%) | 35 | 383 |
| BMI (kg/m2) | 18.9 (15.8, 24.4) | 19.3 (15.6, 25.0) |
| BMI-for-age (z score) | 0.31 (−0.72, 1.55) | 0.32 (−0.81, 1.56) |
| Triceps skinfold thickness (mm) | 11 (7, 21) | 17 (11, 26)3 |
| Subscapular skinfold thickness (mm) | 7 (5, 17) | 10 (6, 23)3 |
| SF sum (mm) | 19 (13, 38) | 27 (17, 48)3 |
| Triglycerides (mg/dL) | 61 (40, 100) | 66 (45, 107)3 |
| LDL cholesterol (mg/dL) | 95 (72, 124) | 98 (75, 127)3 |
| HDL cholesterol (mg/dL) | 55 (41, 72) | 54 (41, 72) |
| Fasting insulin (mU/L) | 8.0 (5.0, 14.0) | 9.8 (6.0, 17.0)3 |
| SBP (mm Hg) | 104 (93, 116) | 103 (92, 114)3 |
| DBP (mm Hg) | 62 (52, 71) | 64 (54, 73)3 |
1
SF sum, sum of the triceps and subscapular skinfold thicknesses; SBP, systolic blood pressure; DBP, diastolic blood pressure. With the exception of race, which was assessed by using a chi-square test, P values were calculated from robust linear regression models that included age, sex, and race as covariates.
2
Median; 15th and 85th percentile in parentheses (all such values).
3
Significantly different from boys, P < 0.05.