Table 1.
Characteristics of US Adolescents 12 to 19 yr by gender, NHANES IIIa
| Characteristic | All(n = 719)b | Male(n = 337)b | Female(n = 382)b |
|---|---|---|---|
| Age (yr; mean [SE]) | 15.2 (0.2) | 15.2 (0.2) | 15.2 (0.2) |
| Race/ethnicity (% [SE])c | |||
| non-Hispanic white | 69.4 (3.6) | 71.5 (4.4) | 67.2 (3.9) |
| non-Hispanic black | 15.5 (2.1) | 15.2 (2.5) | 15.9 (2.4) |
| Mexican American | 8.3 (1.0) | 8.2 (1.3) | 8.4 (1.3) |
| Serum creatinine (mg/dl; mean [SE]) | 0.72 (0.01) | 0.77 (0.01) | 0.66 (0.01) |
| Cystatin C (mg/L; mean [SE]) | 0.84 (0.01) | 0.89 (0.01) | 0.79 (0.01) |
| BUN (mg/dl; mean [SE]) | 11.00 (0.23) | 13.00 (0.21) | 10.00 (0.34) |
| Uric acid (mg/dl; mean [SE]) | 5.00 (0.06) | 5.60 (0.07) | 4.40 (0.04) |
| CRP (mg/dl) | |||
| <0.22 | 88.9 (2.4) | 88.3 (3.6) | 89.5 (2.1) |
| 0.22 to 1.00 | 7.8 (1.5) | 7.1 (1.9) | 8.6 (1.8) |
| >1.00 | 3.3 (1.4) | 4.6 (2.6) | 1.9 (0.7) |
| %BF (mean [SE]) | 23.10 (0.80) | 18.60 (0.01) | 28.00 (0.80) |
| FFM (mean [SE]) | 47.20 (0.70) | 52.80 (1.10) | 41.00 (0.40) |
| BMI (kg/m2; mean [SE]) | 22.40 (0.45) | 22.50 (0.77) | 22.30 (0.40) |
| Weight categories (% [SE])d | |||
| underweight | 3.2 (0.8) | 2.0 (0.8) | 4.5 (1.6) |
| normal weight | 72.4 (2.9) | 74.2 (4.9) | 70.5 (3.3) |
| at risk | 15.0 (2.4) | 14.1 (3.6) | 16.0 (3.0) |
| overweight | 9.4 (1.8) | 10.0 (3.0) | 8.9 (1.8) |
| Tanner stage (pubic hair; % [SE]) | |||
| I | 3.9 (1.2) | 5.6 (2.1) | 1.9 (1.5) |
| II | 5.8 (1.4) | 7.4 (2.0) | 4.0 (1.9) |
| III | 11.5 (1.9) | 10.6 (3.3) | 12.5 (3.0) |
| IV | 36.3 (3.1) | 33.7 (4.6) | 39.2 (4.5) |
| V | 42.5 (3.6) | 42.7 (4.7) | 42.4 (5.4) |
| Hyperlipidemia (% [SE])e | 1.10 (0.80) | 1.50 (1.20) | 0.70 (0.01) |
| Hypertension (% [SE])e | 2.70 (1.90) | 3.70 (3.40) | 1.70 (1.50) |
a
BMI, body mass index; BUN, blood urea nitrogen; CRP, C-reactive protein; FFM, free-fat mass; NHANES III, Third National Health and Nutrition Examination Survey; %BF, percentage of body fat.
b
n represents the sample size of individuals used to derive nationally representative estimates of US adolescents 12 to 19 yr of age.
c
Other race/ethnicity category not shown.
d
As defined by the Centers for Disease Control and Prevention. See the Materials and Methods section for further details and reference.
e
Self-reported condition. See the Materials and Methods section for further details.\