Monitoring inequities using routine administrative data: a case study of cancer screening in Ontario, Canada

Abstract Routine cancer screening is a critical primary care service to reduce cancer morbidity and mortality, through early detection, diagnosis, and treatment. We evaluated longitudinal changes in socioeconomic inequities in cancer screening in Ontario, Canada, by using linked provincial health administrative databases including 15.9 million records eligible for cancer screening. The rate of colorectal cancer screening increased between 2011 and 2020 (54% to 62%) with a reduction in the indices of inequity (slope index, SII: from 0.36 to 0.33; relative index of inequity, RII: from 0.69 to 0.54). However, the rate of cervical cancer screening decreased (from 76% to 68%), particularly in deprived areas (RII increasing from 0.47 to 0.54). Access to cancer screening is a challenge in deprived areas. Understanding the socio-economic determinants in access to screening across the life course can help develop tailored interventions to increase health equity.