Baseline severity of positive and negative symptoms predicts relapse in opposing directions among placebo-treated schizophrenia patients: analysis of five placebo-controlled, antipsychotic withdrawal, relapse-prevention trials

Background and Hypothesis Identifying which patients with schizophrenia will remain stable and which will relapse is relevant to both trial design and clinical practice. We hypothesized that higher negative and lower positive symptoms at baseline would predict longer time to relapse. Study Design This analysis pooled individual participant data on 557 patients with schizophrenia randomized to placebo from five placebo-controlled antipsychotic withdrawal relapse-prevention studies, each with a double-blind phase of at least 6 months. Relapse was defined as a [≥]12-point increase in Positive

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