Selected baseline characteristics by incident asthma status, National Health and Nutrition Examination Survey I Epidemiologic Follow-up Study, 1971–1975 to 1982–1984
| Baseline characteristics | Incident asthma# | No incident asthma¶ | p-value |
| Age yrs | 46.3 (0.9) | 45.5 (0.2) | 0.924 |
| Males % | 41.3 (3.1) | 47.4 (0.8) | 0.072 |
| Whites % | 90.1 (2.2) | 90.6 (0.7) | 0.838 |
| Education yrs | 11.7 (0.3) | 11.7 (0.1) | 0.881 |
| Current smoker % | 44.6 (3.2) | 38.5 (0.8) | 0.073 |
| Active, recreational activity % | 18.2 (2.5) | 21.2 (0.7) | 0.210 |
| Active, nonrecreational activity % | 41.1 (3.6) | 46.4 (0.9) | 0.132 |
| BMI kg·m−2 | 26.5 (0.4) | 25.8 (0.1) | 0.066 |
Data are presented as mean (se) and % (se), unless otherwise stated
BMI: body mass index
#: n=317
¶: n=9,139