Table 4

Multiple logistic regression analysis of risk factors for recent asthma in Australian preschool children

Risk factor Adjusted odds ratio
(95% CI) for recent
asthma
Adjusted odds ratio (95% CI) for recent asthma (final model without infections)
Significant risk factors (final model) 4-150
Atopic (n=650)2.35 (1.49 to 3.72)2.25 (1.43 to 3.54)
Either parent ever had asthma2.05 (1.34 to 3.16)2.17 (1.42 to 3.31)
Serious respiratory infection in first 2 years of life4-152 1.93 (1.25 to 2.99)
Breast fed ever0.41 (0.22 to 0.74)0.44 (0.25 to 0.80)
Polyunsaturated fats (low is referent category)
 medium1.02 (0.62 to 1.67)1.03 (0.63 to 1.68)
 high2.03 (1.15 to 3.60)1.92 (1.09 to 3.38)
Number of older siblings (0 is referent category)
 11.21 (0.75 to 1.95)1.27 (0.79 to 2.03)
 21.21 (0.65 to 2.23)1.31 (0.72 to 2.41)
 ⩾30.16 (0.04 to 0.71)0.17 (0.04 to 0.75)
Non-significant risk factors (initial model)
Currently living in Lismore (Wagga Wagga is referent category)1.42 (0.92 to 2.18)
Male (female is referent category)1.33 (0.86 to 2.06)
Mother smoked during pregnancy0.77 (0.40 to 1.48)
Either parent smoked in first 6 months of child's life1.62 (0.95 to 2.75)
  • Unless otherwise stated, the referent category for each risk factor is absence of the risk factor. Multivariate analyses were conducted in the 650 children who had skin prick tests.

  • 4-150 55 and 60 children, respectively, were deleted from this analysis due to missing values for one or more variables.

  • 4-152 Serious respiratory infections included pneumonia, bronchiolitis, whooping cough, bronchitis or croup.