Body mass index and quality of life in community-dwelling patients with schizophrenia.

OBJECTIVE To examine the associations between sociodemographic variables, body weight and quality of life in schizophrenic outpatients. METHODS Assessments included an interview to obtain sociodemographic data, administration of a Quality of Life questionnaire (the MOS SF-36) and measurement of height and weight. Body mass index was calculated (kg/m(2)). SF-36 subscores were examined for statistical differences based on BMI categories: healthy weight (BMIor=30). Correlations with sociodemographic variables were also examined. RESULTS Body weight was inversely correlated (level p<or=0.005) to the SF-36 items: physical functioning (PF, -0.452), role limitations due to physical functioning (-0.279), role limitations due to emotional functioning (-0.256), vitality (-0.200), general health (GH, -0.367) and physical component score (PCS, -0.400). Mental component score (MCS) was not significantly correlated to body weight. When comparing quality of life across BMI categories, obese subjects had worse physical functioning (p<or=0.0005) and general health (p<or=0.005), reported more role limitations due to emotional functioning (p<or=0.05) and a lower physical component score (p<or=0.005). Mental component score was not significantly influenced by BMI. CONCLUSIONS Quality of life in schizophrenic patients is related to body weight. The burden of obesity is primarily experienced as a physical problem.