Table 1.
Selected risk factors in allergy development
| Risk factor | OR | 95% CI | P-value |
|---|---|---|---|
| Allergic rhinitis | |||
| Mode of delivery; vaginal | 0.88 | 0.78–0.99 | 0.03 |
| Mode of delivery; Cesarean section | 1.20 | 1.01–1.43 | 0.04 |
| Number of children: 1 | 1.27 | 1.16–1.39 | 8.17 × 10–8 |
| Number of older siblings: 1 | 0.87 | 0.81–0.95 | < 0.001 |
| Number of older siblings: 2 | 0.74 | 0.66–0.83 | 4.48 × 10–7 |
| Number of older siblings: 3 | 0.81 | 0.68–0.98 | 0.02 |
| Number of older siblings: 4 | 0.77 | 0.54–1.04 | 0.09 |
| Number of older siblings: 5 | 0.60 | 0.37–0.98 | 0.04 |
| Number of older siblings: 6 | 0.27 | 0.10–0.76 | 0.01 |
| Bronchial asthma | |||
| Number of older siblings: 1 | 0.84 | 0.72–0.72 | 0.03 |
| Number of older siblings: 2 | 0.68 | 0.54–0.87 | < 0.001 |
| Number of older siblings: 3 | 0.76 | 0.52–1.10 | 0.15 |
| Number of older siblings: 4 | 0.76 | 0.41–1.39 | 0.37 |
| Number of older siblings: 5 | 0.46 | 0.14–1.44 | 0.18 |
| Number of older siblings: 6 | 0.77 | 0.19–3.18 | 0.72 |