Year: 1985 Source: Psychopathology, v.18, no.2-3, (1985), p.140-154 SIEC No: 19870049

A representative sample of hospital records of admissions for depression between 1920 and 1982 was analyzed to assess switch rate to hypomania/mania. Analysis of predisposing factors to a switch shows bipolar patients have a higher switch rate (28.9%) than the unipolars (3.7%). A loglinear analysis together with univariate strategies showed no significant increase in switches of unipolar or bipolar patients between 1920 and 1982. There is no evidence for a treatment induced switch. (LH)