Information was also obtained on alcohol consumption during two other time periods:First trimester—information about drinking in the first trimester was also collected at 18 weeks gestation using the same frequency/quantity response categories as described above. Based on our previous work, for analyses, the groups consuming ≥1 glasses per week during the first trimester were combined [21].When the child was aged 5 years, information was collected on the mother’s pattern of drinking during the past month. This was the last time point before the age of 11 when information was collected on maternal drinking patterns. As above, the consumption of ≥4 units of alcohol on any day was used as an index of postnatal binge pattern of drinking.
