Variable | Wheezing episodes | |||
Brno & Znojmo, Czech Republic | Avon, UK | |||
Unadjusted OR (95%CI) | Adjusted OR (95%CI) | Unadjusted OR (95%CI) | Adjusted OR (95%CI) | |
Subjects n | 3,586 | 3,182 | 10,683 | |
Smoking during pregnancy | ||||
No | 1.00 | 1.00 | 1.00 | 1.00 |
Yes | 1.12 (0.75–1.67) | 0.99 (0.64–1.55) | 1.41 (1.20–1.65) | 1.30 (1.09–1.56) |
p-value | 0.58 | 0.99 | <0.0001 | 0.004 |
Environmental tobacco smoke | ||||
No | 1.00 | 1.00 | 1.00 | 1.00 |
Yes | 1.68 (1.22–2.32) | 1.66 (1.17–2.36) | 1.34 (1.22–1.47) | 1.11 (0.98–1.25) |
p-value | 0.001 | 0.04 | 0.001 | 0.09 |
Sex | ||||
Male | 1.00 | 1.00 | ||
Female | 0.83 (0.66–1.06) | 0.64 (0.58–0.71) | ||
p-value | 0.13 | <0.0001 | ||
Season of birth | ||||
January–March | 1.00 | 1.00 (ref) | ||
April–June | 1.45 (1.00–2.11) | 1.54 (1.28–1.85) | ||
July–September | 1.97 (1.34–2.91) | 1.93 (1.62–2.30) | ||
October–December | 1.75 (1.16–2.64) | 1.64 (1.37–1.97) | ||
p-value | 0.005 | <0.0001 | ||
Maternal age at delivery | ||||
>24 years | 1.00 | 1.00 | ||
20–24 years | 1.65 (1.26–2.17) | 1.14 (0.97–1.33) | ||
<20 years | 1.48 (0.89–2.50) | 1.26 (0.88–1.80) | ||
p-value | 0.001 | 0.17 | ||
Preterm delivery | ||||
>37 weeks | 1.00 | 1.00 | ||
<37 weeks | 2.06 (0.94–4.51) | 1.49 (1.17–1.89) | ||
p-value | 0.07 | 0.001 | ||
Duration of breast feeding | ||||
None | 1.00 | 1.00 | ||
<6 months | 0.56 (0.32–0.99) | 0.87 (0.76–0.99) | ||
≥6 months | 0.99 (0.61–1.63) | 0.73 (0.63–0.84) | ||
p-value | 0.003 | 0.0001 | ||
Maternal parity | ||||
0 | 1.00 | 1.00 | ||
1 | 1.91 (1.45–2.51) | 1.79 (1.58–2.03) | ||
≥2 | 1.95 (1.28–2.97) | 2.11 (1.81–2.45) | ||
p-value | <0.0001 | <0.0001 | ||
Overcrowding in household | ||||
No | 1.00 | 1.00 | ||
Yes | 1.19 (0.92–1.53) | 0.98 (0.84–1.15) | ||
p-value | 0.2 | 0.823 | ||
Maternal history of asthma | ||||
No | 1.00 | 1.00 | ||
Yes | 1.82 (1.10–3.15) | 1.84 (1.58–2.14) | ||
p-value | 0.03 | <0.0001 |
ref: reference value