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Table S1 Frequencies (percentages) of alcohol frequency and quantity in the original categories for each cohort, age group and gender.

Table S2 Tetra- and polychoric twin correlations with 95% confidence intervals for alcohol initiation, frequency and quantity in each age group and cohort, estimated in full saturated models.

Table S3 Initiation of alcohol use: test for cohort and sex differences in thresholds and correlation structure using univariate saturated models.

Table S4 Frequency of alcohol use: test for cohort and sex differences in thresholds and correlation structure using univariate saturated models.

Table S5 Quantity of alcohol use: test for cohort and sex differences in thresholds and correlation structure using univariate saturated models.

Table S6 Goodness-of-fit of the single liability dimension (SLD), independent liability dimension (ILD) and combined model to alcohol frequency and initiation at ages 13–15, within cohorts.

Table S7 Univariate variance decomposition of alcohol initiation: model fitting results in age groups 13–15 and 16–17, on pooled cohorts.

Table S8 Variance decomposition under the combined model: model fitting results for alcohol frequency combined with initiation, age group 13–15, on pooled cohorts.

Table S9 Variance decomposition under the single liability dimension model: model fitting results for alcohol frequency and quantity, age group 16–17, on pooled cohorts.

Table S10 Variance decomposition under the single liability dimension model: model fitting results for alcohol frequency and quantity in age group 18–21, on pooled cohorts.

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