Table 1.
Demographic and clinical characteristics of adolescents aged 12 to 17 years, NHANES 1999–2002
| Creatinine Subsample (n = 3256) | Cystatin C Subsample (n = 811) | |
|---|---|---|
| Mean age, years | 14.5 (SE 0.05) | 14.5 (SE 0.08) |
| Girls, % | 49.1 | 49.7 |
| Race/ethnicity, % | ||
| non-Hispanic black | 14.7 | 14.3 |
| Mexican | 11.0 | 11.0 |
| other Hispanic | 7.8 | 7.7 |
| non-Hispanic white | 60.0 | 57.6 |
| other (including multiracial) | 6.6 | 9.4 |
| BMI weight category, % | ||
| underweight (<5th percentile) | 3.3 | 4.3 |
| healthy weight (5th to <85th percentile) | 64.8 | 63.8 |
| overweight (85th to <95th percentile) | 14.9 | 14.9 |
| obese (≥95th percentile) | 17.0 | 16.9 |
| Systolic BP, % | ||
| ≥90th percentile | 5.9 | 4.4 |
| ≥95th percentile | 3.9 | 2.4 |
| Microalbuminuria, % | (n = 3220) | (n = 799) |
| >30 mcg/mg creatinine | 11.8 | 10.4 |
| Macroalbuminuria, % | (n = 3220) | (n = 799) |
| >300 mcg/mg creatinine | 1.3 | 1.4 |
| Anemic, % | 3.0 | 3.1 |
NHANES, National Health and Nutrition Examination Survey; BMI, body mass index.