Parental history of Type 2 diabetes in patients with nonaffective psychosis

Introduction: We attempted to replicate two previous studies which found an increased risk of diabetes in the relatives of schizophrenia probands. Methods: N = 34 patients with newly-diagnosed nonaffective psychosis and N = 52 non-psychiatric controls were interviewed for parental history of Type 2 diabetes. Results: In a logistic regression model that included multiple potential confounders, psychosis was a significant predictor of Type 2 diabetes in either parent (p < 0.04). Discussion: We found an increased prevalence of Type 2 diabetes in the parents of nonaffective psychosis subjects. This association may be due to shared environmental or genetic risk factors, or both.