Table 1 compares the demographics of the sample across controls and the four psychiatric diagnoses that constitute our sample of individuals with chronic psychotic disorder: schizophrenia, schizoaffective disorder depressed subtype, schizoaffective disorder bipolar subtype, and bipolar disorder with psychotic features. The sample used for this study is a multi-ethnic sample, including African Americans, Asians, European Americans and Hispanics. There are more female subjects with bipolar disorder than with schizophrenia (p<0.001). There is a wide age range among all individuals, although cases are older than the controls in this sample (p<0.001). Therefore, further analyses evaluate associations between the severe psychotic disorders and substance use only after adjusting for race/ethnicity, age, and gender.
