Family/household exposures and other risk factors for chronic respiratory morbidity by randomisation status
| Vitamins (n=386) | Placebo (n=366) | OR (99% CI) | |
| Family history | |||
| Asthma | 31.1% | 35.8% | 0.81 (0.52 to 1.27) |
| Eczema | 38.1% | 37.4% | 1.03 (0.67 to 1.59) |
| Hay fever | 44.8% | 46.2% | 0.95 (0.62 to 1.46) |
| Breast feeding | 72.5% | 71.9% | 1.04 (0.64 to 1.68) |
| Household smoking | 16.3% | 16.4% | 0.99 (0.55 to 1.76) |
| Child contact with smokers | 13.0% | 13.9% | 0.90 (0.48 to 1.70) |
| Housing: owned/mortgage | 79.0% | 81.4% | 0.86 (0.51 to 1.43) |