After residualizing the traits for age, sex and recruitment area a nominally significant couple association was also observed for cigarettes per day ( b = 0.10, (S.E. = 0.05)) (Supplementary Table 3 ) and the couple association for alcohol consumption became stronger ( b = 0.41, (S.E. = 0.02)).
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Genetic and shared couple environmental contributions to smoking and alcohol use in the UK population.
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