TABLE 2. Parental socioeconomic predictors of lower respiratory illness in the first year of life
| Factor |
n |
Percent with LRI |
RR |
95% CI |
|
| Maternal asthma |
|
|
|
|
| No asthma |
345 |
24.9 |
|
|
| Active |
106 |
29.3 |
1.17 |
0.83, 1.66 |
| Inactive |
48 |
33.3 |
1.34 |
0.86, 2.08 |
| Paternal asthma |
|
|
|
|
| No asthma |
376 |
26.5 |
|
|
| Active |
78 |
28.2 |
1.05 |
0.71, 1.55 |
| Inactive |
36 |
25.0 |
0.93 |
0.52, 1.68 |
| Maternal age, yr |
|
|
|
|
| 18 to < 30 |
124 |
25.0 |
|
|
| 30 to < 33 |
125 |
26.4 |
1.06 |
0.69, 1.61 |
| 33 to < 36 |
125 |
28.0 |
1.12 |
0.74, 1.70 |
| 36 to < 46 |
125 |
27.2 |
1.09 |
0.72, 1.65 |
Maternal smoking
in pregnancy |
|
|
|
|
| No |
467 |
27.0 |
|
|
| Yes |
32 |
21.9 |
0.81 |
0.41, 1.59 |
| Breastfeeding |
|
|
|
|
| No |
163 |
31.9 |
|
|
| Yes |
336 |
24.1 |
0.76 |
0.56, 1.01 |
| Family income, $1,000s |
|
|
|
|
| 50 and up |
352 |
27.0 |
|
|
| 30 to < 50 |
88 |
27.3 |
1.01 |
0.69, 1.48 |
| Below 30 |
43 |
20.9 |
0.78 |
0.42, 1.42 |
| Unknown |
16 |
31.3 |
1.16 |
0.55, 2.44 |
|
Definition of abbreviations: CI = confidence interval; LRI = lower respiratory illness; RR = relative risk.