The New Haven Schizophrenia Index, a checklist designed for research use, was evaluated with a sample of 45 male schizophrenics where follow-up information had been obtained for 22 yr. The checklist had high levels of interrater agreement and scores were significantly related to other concurrent measures of thought disorder or psychotic thinking. The index did not have stability or predictive validity in terms of eventual outcome. A measure of affectivity did display both stability and a significant relationship with outcome.
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