• Seven systems for the diagnosis of schizophrenia were compared in their ability to predict short-term outcome at follow-up: (1) with each other, (2) with selected specific symptoms, and (3) with a simple additive composite symptom score. None of the systems nor the symptoms predicted strongly, but DSM-III and Schneiderian First Rank Symptoms and the composite score performed somewhat better than the other predictors.
Endicott J, Nee J, Cohen J, Fleiss JL, Simon R. Diagnosis of SchizophreniaPrediction of Short-term Outcome. Arch Gen Psychiatry. 1986;43(1):13-19. doi:10.1001/archpsyc.1986.01800010015002