For this population-based cohort study, we used linked administrative health and clinical registry data from 2004 to 2018 in Ontario, Canada, (population 14.6 million), where physician and hospital services are provided free of charge to residents. We accessed data at ICES, a nonprofit health care research institute in Toronto that maintains deidentified and linked administrative records for all Ontario residents with a valid health card (Appendix 1, Table S1, available at www.cmaj.ca/lookup/doi/10.1503/cmaj.220689/tab-related-content). The ICES databases are complete and valid for demographic information and primary diagnoses in acute care settings.25 These data are also linked with Ontario’s Better Outcomes Registry and Network (BORN), a prescribed registry where providers enter clinical data into the BORN Information System (BIS) in pregnancy.26 (link) The BIS collects data on screening and disclosure of interpersonal violence in pregnancy. Data from BORN (2012–2014) were securely transferred to ICES under a data sharing agreement, with a linkage success rate of 93.1%.26 (link),27