Table 2.
Baseline characteristics of children with at least one wheeze outcome <5 years and one wheeze outcome ≥5 years (n=1295)
| Total | Girls | Boys | |
|---|---|---|---|
| n=1295 | n=630 | n=665 | |
| N (%) | |||
| Maternal smoking status | |||
| Never | 910 (70.3) | 456 (72.4) | 454 (68.2) |
| Former | 262 (20.2) | 124 (19.6) | 138 (20.8) |
| Smoked during pregnancy | 123 (9.5) | 50 (7.9) | 73 (11.0) |
| Maternal asthma | 166 (12.8) | 85 (13.6) | 80 (12.1) |
| Maternal hay fever | 392 (30.2) | 191 (30.3) | 201 (30.2) |
| Maternal eczema | 167 (12.9) | 77 (12.3) | 89 (13.4) |
| Paternal asthma | 155 (12.0) | 76 (12.0) | 80 (12.0) |
| Paternal hay fever | 343 (26.5) | 171 (27.1) | 173 (26.0) |
| Paternal eczema | 79 (6.1) | 36 (5.7) | 43 (6.5) |
| Household income >$70,000/year | 804 (62.1) | 382 (60.7) | 422 (63.5) |
| Child race/ethnicity | |||
| Black | 172 (13.3) | 82 (13.1) | 90 (13.5) |
| Hispanic | 52 (4.0) | 21 (3.3) | 31 (4.7) |
| White | 881 (68.0) | 433 (68.7) | 448 (67.4) |
| Other | 190 (14.7) | 94 (14.9) | 96 (14.4) |
| Season of birth | |||
| Winter | 332 (25.6) | 159 (25.2) | 173 (26.0) |
| Spring | 328 (25.3) | 163 (25.9) | 165 (24.8) |
| Summer | 350 (27.0) | 168 (26.7) | 182 (27.4) |
| Fall | 285 (22.0) | 140 (22.2) | 145 (21.8) |
| Mean (SD) | |||
| Gestation length, weeks | 39.5 (1.8) | 39.5 (1.8) | 39.4 (1.8) |
| Birthweight for gestational age, z-score | 0.19 (0.97) | 0.19 (0.93) | 0.18 (0.99) |
| Duration of breastfeeding, months | 6.4 (4.6) | 6.4 (4.6) | 6.4 (4.6) |
| N (%) | |||
| Environmental smoke exposure before 1 year | 109 (8.4) | 55 (8.7) | 54 (8.1) |
| Bronchiolitis before age 1 year | 188 (14.5) | 74 (11.7) | 114 (17.1) |
| Atopic dermatitis before age 1 year | 297 (22.9) | 135 (21.4) | 162 (24.3) |