The computer‐assisted interview administered via telephone to the OZ‐ALC GWAS sample included the modified Christchurch Trauma Assessment (Fergusson et al. 1989, 1996a,b; Fergusson and Lynskey 1997) and sections from the SSAGA (Bucholz et al. 1994) that assessed lifetime diagnoses of illicit drug dependence and posttraumatic stress disorder (PTSD) and past year diagnoses of nicotine and alcohol dependence. Since all participants had been assessed previously, other lifetime diagnoses were obtained from previous SSAGA (Bucholz et al. 1994) interview data. A positive response at any assessment was again coded positive. The interview included the modified Neglect Scale (Straus et al. 1995) which had four additional items that assessed emotional abuse (EA) embedded within it.
