Table 1. Socio-demographic characteristics according to asthma status at baseline, Nurses' Health Study II.
| Asthma history before 1989 | |||
|---|---|---|---|
|
| |||
| No | Yes | P | |
| n | 92,737 | 5,311 | |
| Age, m (sd) | 34.3 (4.7) | 35.0 (4.6) | <0.001 |
| Age group | |||
| 24-30 | 18.4 | 14.0 | <0.001 |
| 30-35 | 31.9 | 30.6 | |
| 35-40 | 32.5 | 35.7 | |
| 40-44 | 17.2 | 19.8 | |
| Race / ethnicity | |||
| Non white, % | 7.1 | 7.0 | 0.73 |
| Hispanic, % | 1.8 | 2.1 | 0.16 |
| Smoking habits, % | |||
| Never smoker | 65.0 | 64.1 | <0.001 |
| Ex-smoker | 21.1 | 24.5 | |
| Current smoker | 13.8 | 11.3 | |
| missing | 0.1 | 0.1 | |
| BMI, % | |||
| <25 kg/m2 | 69.5 | 60.7 | <0.001 |
| 25-29.9 kg/m2 | 18.6 | 21.0 | |
| ≥ 30 kg/m2 | 11.3 | 17.6 | |
| missing | 0.6 | 0.7 | |
BMI – Body Mass Index