Table 2 Association between smoking exposure and risk of bronchial asthma at the age of 3 years.
Quit before recognising current pregnancy | |||||||
|---|---|---|---|---|---|---|---|
Number of cigarettes smoked per day | Number | cOR (95% CI) | aOR (95% CI) | Duration of smoking (years) | Number | cOR (95% CI) | aOR (95% CI) |
Never | 45,248 | 1.00 | 1.00 | Never | 45,248 | 1.00 | 1.00 |
0–5 | 6,022 | 1.19 (1.08–1.32) | 1.13 (1.01–1.26) | 0–5 | 7,507 | 1.21 (1.11–1.33) | 1.12 (1.01–1.23) |
6–10 | 6,665 | 1.10 (0.99–1.21) | 1.08 (0.97–1.20) | 6–10 | 6,215 | 1.13 (1.02–1.25) | 1.10 (0.99–1.22) |
≥ 11 | 4,717 | 1.16 (1.04–1.30) | 1.09 (0.96–1.23) | ≥ 11 | 3,680 | 1.05 (0.92–1.20) | 1.07 (0.93–1.24) |
Quit after finding out about current pregnancy | |||||||
Number of cigarettes smoked per day | Number | cOR (95% CI) | aOR (95% CI) | Duration of smoking (years) | Number | cOR (95% CI) | aOR (95% CI) |
Never | 45,248 | 1.00 | 1.00 | Never | 45,248 | 1.00 | 1.00 |
0–5 | 1,842 | 1.24 (1.05–1.47) | 1.12 (0.93–1.36) | 0–5 | 1,315 | 1.28 (1.05–1.56) | 1.14 (0.91–1.44) |
6–10 | 3,967 | 1.38 (1.24–1.56) | 1.27 (1.11–1.45) | 6–10 | 2,875 | 1.36 (1.19–1.55) | 1.13 (0.97–1.33) |
≥ 11 | 3,166 | 1.15 (1.00–1.32) | 0.99 (0.84–1.17) | ≥ 11 | 4,786 | 1.22 (1.09–1.36) | 1.15 (1.01–1.31) |
Still smoke | |||||||
Number of cigarettes smoked per day | Number | cOR (95% CI) | aOR (95% CI) | Duration of smoking (years) | Number | cOR (95% CI) | aOR (95% CI) |
Never | 45,248 | 1.00 | 1.00 | Never | 45,248 | 1.00 | 1.00 |
0–5 | 970 | 1.62 (1.31–2.00) | 1.20 (0.93–1.54) | 0–5 | 241 | 1.71 (1.13–2.57) | 1.20 (0.71–2.05) |
6–10 | 1,115 | 1.80 (1.49–2.17) | 1.43 (1.14–1.80) | 6–10 | 706 | 2.04 (1.62–2.55) | 1.34 (1.02–1.77) |
≥ 11 | 559 | 2.22 (1.74–2.84) | 1.53 (1.13–2.06) | ≥ 11 | 1,696 | 1.75 (1.50–2.04) | 1.39 (1.15–1.68) |
