Retest data were collected for a small subsample of the participants (n = 166) several months after their initial interview [mean interval = 3.4 months (standard deviation (S.D.) = 1.4 months, range = 1.2–9.5 months]. These data were used to evaluate the test-retest reliability of the diagnostic measures, using the kappa (κ) (Cohen, 1968) and Yule’s Y (Spitznagel & Helzer, 1985) coefficients.
