• Richard H Glazier, Michael E Green, Fangyun C Wu, Eliot Frymire, Alexander Kopp, and Tara Kiran.
• ICES Central (Glazier, Wu, Kopp, Kiran); Primary Care and Health Systems (Glazier, Kiran, Kopp); St. Michael's Hospital Centre for Urban Health Solutions (Glazier, Kiran), Toronto, Ont.; Department of Family Medicine, and Health Services and Policy Research Institute (Green), Queen's University, Kingston, Ont.; Health Services and Policy Research Institute, Queen's University, and ICES Queen's (Frymire), Kingston, Ont.; Department of Family and Community Medicine (Glazier, Kiran), St. Michael's Hospital, University of Toronto, Toronto, Ont. rick.glazier@ices.on.ca.
• CMAJ. 2021 Feb 8; 193 (6): E200-E210.

BackgroundGlobally, primary care changed dramatically as a result of the coronavirus disease 2019 (COVID-19) pandemic. We aimed to understand the degree to which office and virtual primary care changed, and for which patients and physicians, during the initial months of the pandemic in Ontario, Canada.MethodsThis population-based study compared comprehensive, linked primary care physician billing data from Jan. 1 to July 28, 2020, with the same period in 2019. We identified Ontario residents with at least 1 office or virtual (telephone or video) visit during the study period. We compared trends in total physician visits, office visits and virtual visits before COVID-19 with trends after pandemic-related public health measures changed the delivery of care, according to various patient and physician characteristics. We used interrupted time series analysis to compare trends in the early and later halves of the COVID-19 period.ResultsCompared with 2019, total primary care visits between March and July 2020 decreased by 28.0%, from 7.66 to 5.51 per 1000 people/day. The smallest declines were among patients with the highest expected health care use (8.3%), those who could not be attributed to a primary care physician (10.2%), and older adults (19.1%). In contrast, total visits in rural areas increased by 6.4%. Office visits declined by 79.1% and virtual care increased 56-fold, comprising 71.1% of primary care physician visits. The lowest uptake of virtual care was among children (57.6%), rural residents (60.6%) and physicians with panels of ≥ 2500 patients (66.0%).InterpretationPrimary care in Ontario saw large shifts from office to virtual care over the first 4 months of the COVID-19 pandemic. Total visits declined least among those with higher health care needs. The determinants and consequences of these major shifts in care require further study.© 2021 Joule Inc. or its licensors.

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