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

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).

	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

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.

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