Comparison of CATEGO-derived ICD-8 and DSM-III classifications using the composite international diagnostic interview in severely ill subjects.

Two classifications, DSM-III and CATEGO4-derived ICD-8, included in the CIDI, are compared in 63 in-patients and out-patients with a broad range of psychiatric illness. Agreement for main diagnosis between these classifications was statistically significant for two time frames, the present state and lifetime. However, while diagnostic assignment by CATEGO4 remained fairly constant between time frames, there was a marked shift in DSM-III-assigned diagnosis, with cases changing from anxiety state diagnosis (present state) to affective disorder (lifetime). Thirty-nine subjects were assigned a DSM-III diagnosis of affective disorder for lifetime illness compared with 21 assigned to this diagnostic group by CATEGO4.