The Influence of Age, Sex, and Socioeconomic Status on Glycemic Control Among People with Type 1 and Type 2 Diabetes in Canada: A Patient-Led Longitudinal Retrospective Cohort Study

Background Clinical guidelines for most adults with diabetes recommend maintaining hemoglobin A1c (HbA1c) ≤7.0% (<53 mmol/mol) to avoid microvascular and macrovascular complications. People with diabetes of different ages, sexes, and socioeconomic statuses may differ in their ease of attaining this goal. As a team of people with diabetes, researchers, and health professionals, we aimed to explore patterns in HbA1c results among people with type 1 or type 2 diabetes in Canada. Our research question was identified by people living with diabetes. Methods We used generalized estimating equations to analyze the effects of age, sex and socioeconomic status in 947,543 HbA1c results measured from 2010 to 2019 among 90,770 people living with type 1 or 2 diabetes in Canada. People living with diabetes reviewed and interpreted the results. Results HbA1c results at or below 7.0% represented 30.5% (male people living with type 1 diabetes), 21.0% (female people living with type 1 diabetes), 55.0% (male people living with type 2 diabetes) and 59.0% (female people living with type 2 diabetes) of results in each subcategory. We observed higher HbA1c values during adolescence and, for people living with type 2 diabetes, among people living in lower income areas. Among those with type 1 diabetes, female people tended to have lower HbA1c than male people during childbearing years but higher HbA1c than male people during menopausal years. Team members living with diabetes confirmed that the patterns we observed reflected their own life courses and suggested these results be communicated to health professionals and other stakeholders to improve treatment for people living with diabetes. Interpretation A substantial proportion of people with diabetes in Canada are insufficiently supported to maintain guideline-recommended glycemic control goals. Blood sugar management goals may be particularly challenging for people who are going through adolescence, menopause, or living with fewer financial resources. Health professionals should be aware of the challenging nature of glycemic management and policymakers in Canada should provide more support for people with diabetes to live healthy lives.