Table 2.

Associations between potential confounders and child genotype score

	Child genotype score (number of risk allelesa)
	≤2	3	≥4	p value
	N = 1,400	N = 1,552	N = 592
Potential confounders
Mother smoked in pregnancy	13.7%	13.3%	15.4%	.449b
Mother depressed in pregnancy	8.4%	7.0%	9.7%	.092b
Manual social class	14.6%	12.7%	14.8%	.294b
Mother low education	52.7%	54.0%	54.0%	.757b
Mother's age in years: Mean (SD)	29.3 (4.5)	29.1 (4.4)	30.0 (4.4)	.016c

% = column percent.

^aTotal number of risk alleles in ADH1A rs2866151 rs975833, ADH1B rs4147536 and ADH7 rs284779.

^bChi‐squared test.

^cLinear regression analysis.