PDs were assessed using a Norwegian version of the Structured Interview for DSM-IV Personality [36]. It is a comprehensive semi-structured interview of all DSM-IV Axis II diagnoses, rating the specific DSM-IV criteria according to following coding: 0 = not present or limited to rare isolated examples; 1 = subthreshold (some evidence of the trait, but not sufficiently pervasive for the criterion to be considered present); 2 = present (criterion clearly present for most of the time during last 5 years); 3 = strongly present (associated with subjective distress or some impairment in social or occupational functioning or intimate relationships). All 80 criteria were assessed without skip rules. Inter-rater reliability was assessed based on 2 raters’ scoring of 70 audiotaped wave 2 interviews: intra-class correlations for the number of endorsed PD criteria within disorder ranged from 0.81 to 0.96.
