Demographics of study population
| Total participants | 906 |
| Age, mean±SD | 15.6±1.31 |
| Age by year | (n (%)) |
| 13 | 18 (2) |
| 14 | 174 (19) |
| 15 | 271 (30) |
| 16 | 210 (23) |
| 17 | 135 (15) |
| 18 | 90 (10) |
| 19 | 8 (1) |
| Sex | (n (%)) |
| Male | 628 (70) |
| Female | 278 (30) |
| Ethnicity | (n (%)) |
| Caucasian | 687 (76) |
| Asian | 57 (6) |
| Hispanic | 61 (7) |
| African-American | 36 (4) |
| Other or unreported | 65 (7) |
| Height (in), mean±SD | 66.9±3.6 |
| Weight (lbs), mean±SD | 146±31.6 |
| BMI, mean±SD | 23.3±9.1 |
| Normal (n (%)) | 634 (70) |
| Overweight (n (%)) | 173 (19) |
| Obese (n (%)) | 99 (11) |
| Elevated blood pressure | |
| >95th percentile (n (%)) | 138 (15) |
BMI, body mass index.