We considered all people in Ontario identified as female on their health card who were aged 15–49 years and who became pregnant between Apr. 1, 2004, and Mar. 31, 2018. We excluded nonresidents of Ontario and those without a valid health card as we could not accurately link their information across databases. We identified schizophrenia using a previously validated algorithm requiring at least 1 hospital admission or at least 3 outpatient contacts for schizophrenia or a related psychotic disorder (using codes F20, F25 and F29 in the International Statistical Classification of Diseases and Related Health Problems, 10th Revision [ICD-10]) within 3 years of each other from database inception to the index pregnancy (sensitivity 90.1% and specificity 68.0% v. clinical charts in our data sets).28 (link) We did not include those who received diagnoses of schizophrenia during the pregnancy. All remaining pregnancies formed the reference group. For analyses related to screening and self-reported interpersonal violence, we created a subcohort of patients with data linked to the BIS.