Relationship between family size indicators in 1988 and 1995 and asthma ever and hay fever in 1995
| Family size indicators | Odds ratio (95% CI) for asthma | Odds ratio (95% CI) for hay fever |
|---|---|---|
| First born | 1.00 (reference) | 1.00 (reference) |
| Birth order = 2 | 1.00 (0.68 to 1.39) | 0.77 (0.52 to 1.15) |
| Birth order = 3 | 0.86 (0.56 to 1.33) | 0.62 (0.36 to 1.07) |
| Birth order = 4 | 0.84 (0.45 to 1.56) | 0.72 (0.34 to 1.53) |
| Birth order = 5 or more | 0.93 (0.58 to 3.78) | 0.65 (0.19 to 2.27) |
| Increase in resident number in 1988 (per resident) | 1.08 (0.96 to 1.22) | 0.89 (0.76 to 1.03) |
| Increase in resident number in 1995 (per resident) | 0.82 (0.73 to 0.93) | 0.82 (0.70 to 0.95) |
| Resident density in 1988 >0.8 residents per room, excluding bathroom and toilet | 1.26 (0.93 to 1.71) | 0.67 (0.45 to 0.98) |
| Resident density in 1995 >0.8 residents per room, excluding bathroom and toilet | 0.61 (0.44 to 0.84) | 0.64 (0.43 to 0.95) |
| Increase in sibling number in 1995 (per sibling) | 0.83 (0.71 to 0.97) | 0.74 (0.61 to 0.89) |
| Increase in older sibling number in 1995 (per sibling) | 1.00 (0.87 to 1.16) | 0.87 (0.72 to 1.04) |
| Increase in older sibling number in 1995 (per sibling)3-150 | 0.96 (0.83 to 1.20) | 0.82 (0.68 to 1.00) |
| Increase in younger sibling number in 1995 (per sibling) | 0.82 (0.69 to 0.97) | 0.84 (0.68 to 1.03) |
| Increase in younger sibling number in 1995 (per sibling)3-150 | 0.81 (0.68 to 0.97) | 0.79 (0.64 to 0.98) |
↵3-150 In a model with older sibling number and young sibling number as separate terms.