past 12 months. All questions used standard Australian drinks [=10g of alcohol]. Diagnostic sections on smoking, anxiety, depression and conduct disorder were included based on their relevance for understanding alcoholism genetics. Given the potential for inaccurate reporting by interviewed parents (mean age 66, range 49–91), parent reports were limited to smoking history. In some cases interview data were only available from previous diagnostic assessments, with slight variations in assessment protocol, so that not all consumption measures were available for all individuals in the GWAS sample (Table S3 in the Supplement).
