Table 7.
Odds ratios for asthma and wheezing
| Wheezing or whistling in chest in previous 12 months | Gestation at birth (weeks) | ||||
|---|---|---|---|---|---|
| <32 | 32-33 | 34-36 | 37-38 | 39-41 | |
| At 3 years: | (n=159) | (n=157) | (n=833) | (n=2873) | (n=9917) |
| No (%) | 63 (37.7) | 42 (26.8) | 214 (23.3) | 600 (20.2) | 1889 (18.6) |
| Unadjusted odds ratio (95% CI) | 2.9 (1.9 to 4.4) | 1.8 (1.2 to 2.8) | 1.4 (1.2 to 1.7) | 1.1 (1.0 to 1.3) | 1 |
| Adjusted* odds ratio (95% CI) | 2.6 (1.7 to 4.0) | 1.7 (1.1 to 2.6) | 1.3 (1.0 to 1.5) | 1.1 (1.0 to 1.2) | 1 |
| At 5 years: | (n=164) | (n=148) | (n=853) | (n=2845) | (n=9932) |
| No (%) | 56 (34.1) | 34 (23.0) | 183 (20.9) | 486 (17.2) | 1556 (15.0) |
| Unadjusted odds ratio (95% CI) | 3.1 (2.0 to 4.8) | 1.8 (1.1 to 3.0) | 1.6 (1.3 to 1.9) | 1.2 (1.1 to 1.3) | 1 |
| Adjusted* odds ratio (95% CI) | 2.9 (1.9 to 4.6) | 1.7 (1.0 to 2.8) | 1.5 (1.2 to 1.8) | 1.2 (1.0 to 1.3) | 1 |
All percentages and odds ratios are weighted with sampling and non-response weights.
*Adjusted for child’s age at interview, sex, and ethnicity; maternal age at birth, marital status, education, and occupation; whether child was mother’s firstborn; duration of breast feeding; and maternal smoking and alcohol intake during pregnancy.