TABLE 1. Familial and perinatal predictors of lower respiratory illness in the first year of life
| Factor |
n |
Percent with LRI |
RR |
95% CI |
|
| Sex |
|
|
|
|
| Female |
233 |
20.2 |
|
|
| Male |
266 |
32.3 |
1.60 |
1.18, 2.18 |
| Birth weight, kg |
|
|
|
|
| 3.79 to < 4.91 |
125 |
28.8 |
|
|
| 3.46 to < 3.79 |
121 |
21.5 |
0.75 |
0.48, 1.16 |
| 3.18 to < 3.46 |
127 |
31.5 |
1.09 |
0.75, 1.59 |
| 1.84 to < 3.18 |
125 |
24.8 |
0.86 |
0.57, 1.30 |
| Season of birth |
|
|
|
|
| Winter, Dec–Feb |
123 |
17.1 |
|
|
| Spring, Mar–May |
144 |
26.4 |
1.55 |
0.96, 2.49 |
| Summer, Jun–Aug |
111 |
33.3 |
1.95 |
1.22, 3.12 |
| Fall, Sep–Nov |
121 |
30.6 |
1.79 |
1.12, 2.87 |
| Race/ethnicity |
|
|
|
|
| White |
375 |
28.0 |
|
|
| Black |
59 |
25.4 |
0.91 |
0.57, 1.45 |
| Hispanic |
30 |
23.3 |
0.83 |
0.43, 1.63 |
| Asian |
28 |
14.3 |
0.51 |
0.20, 1.28 |
| Other |
7 |
28.6 |
1.02 |
0.31, 3.33 |
|
Definition of abbreviations: CI = confidence interval; LRI = lower respiratory illness; RR = relative risk.