Table 1.
Characteristics of students with asthma and nonasthmatic control subjects.
| Characteristics | Students with asthma | Nonasthmatic control students | P value |
|---|---|---|---|
| Gender n (%) | |||
| Male | 147 (56.1) | 580 (45.4) | 0.002 |
| Female | 115 (43.9) | 697 (54.6) | |
| Birth order n (%) | |||
| 1 | 123 (46.9) | 640 (50.1) | 0.639 |
| 2 | 97 (37.0) | 470 (36.8) | |
| 3 | 28 (10.7) | 117 (9.2) | |
| 4 | 12 (4.6) | 39 (3.1) | |
| ≥5 | 2 (0.8) | 11 (0.9) | |
| In utero exposure to smoking n (%) | |||
| Yes | 221 (84.4) | 1140 (89.3) | 0.021 |
| No | 41 (15.6) | 136 (10.7) | |
| Gestational age (weeks) n (%) | |||
| <36 | 65 (25.5) | 303 (24.4) | 0.494 |
| 36–40 | 176 (69.0) | 853 (68.8) | |
| >40 | 14 (5.5) | 84 (6.8) |