Participant characteristics (N=929)
| Subjects n | 929 |
| Child | |
| Sex | |
| Male | 466 (50) |
| Female | 463 (50) |
| Race/ethnicity | |
| Black | 154 (17) |
| Hispanic | 40 (4) |
| Asian | 28 (3) |
| White | 593 (64) |
| Other or >1 race/ethnicity | 113 (12) |
| Early teen visit | |
| Age years | 13±1 |
| Age at visit years | |
| 11.9 to <13 | 505 (54.4) |
| 13.0 to <15.0 | 374 (40.3) |
| 15.0 to 16.6 | 50 (5.4) |
| Height cm | 160±9 |
| BMI percentile category % | |
| <5th | 30 (3) |
| 5−<85th | 634 (68) |
| >85th | 262 (28) |
| Exhaled nitric oxide ppb | 26±27 |
| Exhaled nitric oxide | |
| <20 ppb | 553 (60) |
| 20−≤35 ppb | 196 (21) |
| >35 ppb | 180 (19) |
| Current asthma | |
| No | 682 (86) |
| Yes | 115 (14) |
| Ever allergic rhinitis | |
| No | 690 (79) |
| Yes | 179 (21) |
| Any aeroallergen IgE >0.35 kU·L−1 | |
| No | 247 (42) |
| Yes | 345 (58) |
| Annual household income at early teen visit $1000 | 109±44 |
| Any smokers at home at early teen visit | 114 (12) |
| Mother/family | |
| Pregnancy smoking status | |
| Never | 653 (71) |
| Former | 188 (20) |
| During pregnancy | 85 (9) |
| College graduate | |
| No | 264 (29) |
| Yes | 662 (71) |
| Median value owner-occupied housing $1000# | 263±149 |
| Percent with education higher than a bachelor's degree# | 42±20 |
Data are presented as n (%) or mean±sd, unless otherwise stated. BMI: body mass index; Ig: immunoglobulin. #: based on census tract, mid-childhood.