• The long form of the Wittenborn Psychiatric Rating Scale was used every six months to rate the symptoms of a sample of 75 schizophrenic men during the 24-month period following their admission to the hospital. The greatest diminution of symptoms assessed in this manner occurred during the first six months of treatment, and rated symptom severity at the time of admission showed relatively little predictive promise for ratings of the respective symptoms at the end of six months. After the initial six-month period, however, the symptoms became increasingly stable and symptom ratings at 12 and 18 months had substantial predictive implications for respective symptom ratings for 24 months.
Factor analyses of the intercorrelated scores showed that two transcending patterns were conspicuous throughout the 24month period.
Wittenborn JR. Stability of Symptom Ratings for Schizophrenic Men. Arch Gen Psychiatry. 1977;34(4):437-440. doi:10.1001/archpsyc.1977.01770160071005