Equity in the use of physician services in Canada's universal health system: A longitudinal analysis of older adults.

This study presents longitudinal evidence on the trends and determinants of income-related inequities in general practitioner (GP), specialist, and any physician visits among older adults (aged 65+) in Canada. Using the Canadian National Population Health Survey between 1998/99 and 2010/11, random effect probit and negative binomial models were employed to model the probability of visit and the total number of visits, respectively. The concentration index-based horizontal inequity (HI) approach was used to measure income-related inequities in physician services.