The validity of the interviewer severity ratings in groups of ASI interviewers with varying training

Aims. This study evaluated the hypothesis that the subjective interviewer s everity rating (ISR) summary indices of the intake Addiction Severity Index (ASI) of less trained interviewers are less valid than those of more highl y trained interviewers. Design. Baseline ASIs from three completed studies whose interviewers varied in degree of initial ASI training and subsequent quality assurance monitoring were examined. Associations between baseline I SRs and three other sets of ASI summary indices not based on interviewer ra tings-composite scores, clinical indices and evaluation indices-were compar ed for three groups of interviewers with varying amounts of training. The a ssumption underlying these analyses was that more reliable ISRs, found in m ore trained interviewers, would be more highly associated with the other mo re objective indices, Setting. Methadone maintenance patients in the Philad elphia and New York City areas. Participants. Thirty-five interviewers with the most intense training who administered 295 interviews; 10 interviewers with an intermediate level of training who administered 763 interviews; an d eight identified (and other unidentified) least trained interviewers who administered a total of 276 interviews. Measurements and methods. Four sets of summary indices from the above ASIs. Both bivariate and multivariate an alyses were performed. Findings. The study found that the validity of the v alidity of ISRs was greater in more trained interviewers. Conclusions. Grea ter training and subsequent monitoring of ASI interviewers generally appear s to be associated with increased ISR validity.