Influence of Age, Sex, and Generation on Physician Payments and Clinical Activity in Ontario, Canada: An Age-Period-Cohort Analysis

Abstract

To compare the effect of age, sex and generation on physician practice patterns in Ontario, Canada. Retrospective cohort study. Physician and patient data from 1992-2013 were used to calculate the yearly number of physicians, distinct patients seen, patient visits, government payments, physician age, sex, specialty, and year of birth. Age-period-cohort models were used for analysis. There was a negligible change in the number of distinct patients for all physicians and family physicians and a 20.6% decrease for ophthalmologists. There were small declines in yearly visits for all physicians (14.2%) and family physicians (17.3%) and a 10.0% increase for ophthalmologists. There were a lower number of visits (and patients for ophthalmologists) in each succeeding recent birth cohort. For all groups and birth cohorts, male physicians had a significantly greater number of visits and patients. Median payments increased over time in all groups and were less for women with an average women-to-men ratio of 0.64 for all physicians, 0.75 for family physicians, and 0.59 for ophthalmologists. After adjusting for the number of visits and patients, sex differences in payments remained significant for all physicians and ophthalmologists but were no longer significant for family physicians. Younger cohorts of Ontario physicians have greater yearly payments compared with older cohorts at the same age despite similar or a slightly lower number of visits and patients. The sex gap of payments was mostly explained by differences in the number of patients and visits for family physicians but remained significant for all physicians and ophthalmologists.