Highlights • We identified four parental substance use classes using quantity-frequency measures.• Heavy use of alcohol formed a class which also included a large proportion of drug users.• Mothers’ and… Click to show full abstract
Highlights • We identified four parental substance use classes using quantity-frequency measures.• Heavy use of alcohol formed a class which also included a large proportion of drug users.• Mothers’ and their partner’s tended to have similar patterns of substance use behaviours.
               
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