Psychosis develops through several phases. Longitudinal high-risk studies and birth cohort studies have shown that persons who later develop schizophrenia have lower cognitive and social function levels, slower neuromotor development and more emotional problems. Almost 20 percent achieve full recovery after a psychotic episode, approximately 25 percent undergo remission, but do not meet the criteria for full recovery, 15 percent need institutional care, and another approx. 40 percent remain chronically psychotic.