A modified version of the SCID Screen questionnaire covering 103 criteria by means of 124 questions was compared with SCID II interviews in 69 psychiatric patients. The correlation between the number of criteria fulfilled in the SCID II interviews or the questionnaires was 0.84. In the SCID interviews, 54% of the patients had a personality disorder. When the SCID Screen questionnaire was used, 73% had a personality disorder. When the cut-off level for diagnosis was adjusted, the frequency found by means of the SCID screen questionnaire or the interviews was roughly the same, 58% and 54%, respectively. The overall kappa for agreement between the SCID II interviews and questionnaire with adjusted cut-off was 0.78.