Factors associated with parental report of early respiratory illness in 1988
| Factor | Adjusted1-150odds ratio (95% CI) for URTI at home interview | Adjusted1-150 odds ratio (95% CI) for LRTI at telephone interview |
|---|---|---|
| First born child | 0.74 (0.56 to 0.98) | 0.63 (0.39 to 1.00) |
| Number of household residents in 1988 (per resident) | 1.17 (1.05 to 1.31) | 1.06 (0.89 to 1.26) |
| Resident density in 1988 (increasing resident number per room) | 1.77 (1.07 to 2.94) | 0.86 (0.37 to 2.01) |
| Family history of asthma (grandparents, mother, father and siblings) | 1.17 (0.87 to 1.56) | 1.57 (1.00 to 2.45) |
| Infant born during winter (during July/August) | 1.91 (1.40 to 2.62) | 2.61 (1.62 to 4.21) |
| Maternal postnatal smoking | 1.47 (1.11 to 1.94) | 1.40 (0.89 to 2.18) |
| Other resident postnatal smoking | 1.45 (1.09 to 1.93) | 1.39 (0.89 to 2.18) |
| Exclusive breast feeding at home interview | 0.60 (0.44 to 0.81) | 0.58 (0.35 to 0.95) |
| Infant sleeps in a room alone at home interview | 0.70 (0.51 to 0.95) | 0.79 (0.48 to 1.30) |
| Infant sex (male) | 1.09 (0.80 to 1.49) | 0.87 (0.54 to 1.41) |
| Infant birth weight (<2500 g) | 0.72 (0.49 to 1.06) | 0.77 (0.43 to 1.35) |
↵1-150 Adjusted for postnatal age at interview.
URTI = upper respiratory tract infection; LRTI = lower respiratory tract infection.