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Table 4 Different exposure and risk behaviours at 2 years after birth and the change in annual prevalence for the intervention cohort and for the control cohort (PACT 2009).

From: A primary health-care intervention on pre- and postnatal risk factor behavior to prevent childhood allergy. The Prevention of Allergy among Children in Trondheim (PACT) study

  Intervention Cohort (n = 1267)   Control Cohort (n = 4826)
  Rate % 95% CI P trend* Rate % 95% CI P trend* OR* 95% CI
At 2 year after birth           
Maternal smoking 123/1244 9.9 8.4-11.7 0.87 885/4661 19.0 17.9-20.1 <0.001 0.50 0.41-0.61
Paternal smoking 136/1183 11.5 9.8-13.4 0.11 760/4217 18.0 16.9-19.2 <0.001 0.62 0.51-0.75
Keeping dog in house 96/1198 8.0 6.6-9.7 0.53 368/4403 8.4 7.6-9.2 0.23 0.95 0.75-1.21
Keeping cat in house 133/1198 11.1 9.4-13.0 0.41 398/4403 9.0 8.2-9.9 0.71 1.31 1.06-1.62
Indoor dampness index 46/1259 3.7 2.7-4.9 0.10 170/4740 3.6 3.1-4.2 0.11 1.03 0.74-1.45
Children's diet at 2 year of age           
Cod liver oil 4 times a week or more 539/1257 42.9 40.2-45.6 0.43 1609/4767 33.8 32.4-35.1 0.80 1.44 1.27-1.64
Any kind of fish once a week or more 926/1258 73.6 71.1-76.0 0.87 3398/4782 71.1 69.8-72.3 0.96 1.13 0.98-1.30
Oily fish once a week or more 625/1264 49.4 46.7-52.2 0.04 1679/4809 34.9 33.6-36.3 <0.001 1.85 1.63-2.10
Lean fish once a week or more 768/1256 61.1 58.4-63.8 0.61 3086/4776 64.6 63.3-66.0 0.07 0.85 0.75-0.97
Vegetables almost daily 630/1252 50.3 47.6-53.1 0.25 2340/4735 49.4 48.0-50.8 <0.001 1.01 0.89-1.15
  1. Comparisons of risk behaviour between the control cohort and the intervention cohort are presented as OR with 95% CI (Based on logistic regression). Change in annual prevalence (intervention cohort 2006-2009, control cohort 2000-2005) presented as p- value for trend. *Adjusted for maternal age, parity, parental atopy, homeowner.