Variation in atopic disease by sibling number
| Siblings | Asthma prevalence | OR (95% CI) for asthma | Current asthma prevalence | OR (95% CI) for current asthma | Hay fever prevalence | OR (95% CI) for hay fever | Eczema prevalence | OR (95% CI) for eczema |
|---|---|---|---|---|---|---|---|---|
| None | 34.6% (124/358) | 1.00 (reference) | 24.4% (87/356) | 1.00 (reference) | 22.9% (82/358) | 1.00 (reference) | 23.3% (84/361) | 1.00 (reference) |
| 1 | 28.8% (700/2427) | 0.76 (0.60, 0.97) | 17.9% (431/2406) | 0.67 (0.52, 0.88) | 22.0% (536/2433) | 0.95 (0.73, 1.24) | 22.5% (550/2440) | 0.96 (0.74, 1.25) |
| 2 | 24.9% (479/1925) | 0.63 (0.49, 0.80) | 14.8% (283/1918) | 0.54 (0.41, 0.70) | 17.2% (330/1923) | 0.70 (0.53, 0.92) | 21.2% (409/1920) | 0.89 (0.68, 1.16) |
| 3 | 26.5% (228/862) | 0.68 (0.52, 0.88) | 17.1% (147/859) | 0.64 (0.47, 0.86) | 17.7% (153/865) | 0.72 (0.53, 0.98) | 21.6% (187/867) | 0.91 (0.68, 1.22) |
| 4 | 24.3% (66/272) | 0.61 (0.43, 0.86) | 15.5% (42/271) | 0.57 (0.38, 0.85) | 15.6% (43/275) | 0.62 (0.41, 0.94) | 18.6% (51/274) | 0.75 (0.51, 1.11) |
| ⩾5 | 25.8% (34/132) | 0.65 (0.42, 1.02) | 17.4% (23/132) | 0.65 (0.39, 1.09) | 20.5% (27/132) | 0.87 (0.53, 1.41) | 19.5% (26/133) | 0.80 (0.49, 1.31) |