We assessed within-instrument inter-rater reliability in the subsample that was interviewed twice with the SSADDA (N=123). Individual DSM-IV OD criteria were also assessed with respect to their inter-rater reliability. We also evaluated the OD diagnostic concordance between instruments (SSADDA vs. MINI) in all 578 participants. Given the anticipated prevalence of the trait in the study population (>10%), all statistical analyses were conducted in SAS using the κ statistic for chance-corrected agreement (AGREE option in PROC FREQ) (Cohen, 1988). Reliability and concordance were categorized according to previously suggested criteria (i.e., <0.40 as poor; 0.40–0.59 as fair; 0.60–0.74 as good; and 0.75–1.00 as excellent) (Cicchetti & Sparrow, 1981).
