DSM-IV LTH-AD was assessed using the Structured Clinical Interview for DSM-IV (SCID) (American Psychiatric Association 1994; Spitzer and Williams, 1985), administered by clinically trained interviewers. Given that the aim of the study was to investigate the reliability of LTH of DSM-IV AD at time 1, this was the target of assessment at both time 1 and time 2.
