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Table 2 Different exposure and risk behaviours assessed at 6 weeks after birth and the hange 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 = 1685)   Control Cohort (n = 3142)
  Rate % 95% CI P trend* Rate % 95% CI P trend* OR* 95% CI
At start pregnancy           
Maternal smoking 283/1636 17.3 15.5-19.2 0.001 702/2969 23.6 22.2-25.2 0.01 0.70 0.60-0.82
Paternal smoking 292/1594 18.3 16.5-20.3 0.001 652/2803 23.3 21.7-24.9 0.03 0.80 0.68-0.94
During pregnancy           
Maternal cod liver oil 4 times a week or more 1098/1660 66.1 63.8-68.4 0.59 1288/3055 42.2 40.4-43.9 0.16 2.44 2.15-2.78
Maternal oily fish intake once a week or more 624/1553 40.2 37.8-42.6 0.61 858/2812 30.5 28.8-32.2 0.36 1.51 1.32-1.72
Maternal lean fish intake once a week or more 658/1666 39.5 37.2-41.9 0.61 807/3055 26.4 24.9-28.0 0.40 1.80 1.58-2.06
Maternal vegetable almost daily 876/1476 59.3 56.8-61.9 0.25 1548/2704 57.2 55.4-59.1 0.15 1.06 0.93-1.21
At 6 weeks after birth           
Maternal smoking 87/1634 5.3 4.3-6.5 0.002 317/2934 10.8 9.7-12.0 <0.001 0.55 0.42-0.70
Paternal smoking 200/1587 12.6 11.1-14.3 0.04 593/2768 21.4 19.9-23.0 0.01 0.59 0.49-0.70
Keeping dog in house 142/1566 9.1 7.7-10.6 0.69 289/2826 10.2 9.16-11.4 0.95 0.83 0.67-1.03
Keeping cat in house 174/1566 11.1 9.7-12.8 0.58 251/2826 8.9 7.9-10.0 0.90 1.32 1.07-1.64
Indoor dampness Index ≥3 69/1672 4.1 3.3-5.2 0.66 129/3062 4.2 3.6-5.0 0.88 1.08 0.79-1.46
Breastfeeding 1644/1665 98.7 98.1-99.2 0.39 3061/3110 98.4 97.9-98.8 0.81 1.00 0.59-1.71
Child having cod liver oil supplement 1011/1665 60.7 58.4-63.0 0.57 1786/3102 57.6 55.8-59.3 0.66 1.03 0.93-1.21
  1. Comparisons of risk behaviour between the intervention cohort and the control cohort are presented as OR with 95% CI (Based on logistic regression). Change in annual prevalence (intervention cohort 2004-2007, control cohort 2000-2003) presented as p- value for trend. *Adjusted for maternal age, parity, parental atopy and homeowner.