Equity of continuous glucose monitoring in young people with type 1 diabetes: a systematic review

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Abstract Background Socioeconomic (SES) and ethnic inequalities in type 1 diabetes (T1D) outcomes are widespread. There is concern that unequal access to technologies, such as continuous glucose monitoring (CGM), may increase disparities. This systematic review summarises the evidence for inequalities in access to CGM for children and young people (CYP) and outcomes for CGM users. Methods MEDLINE, Embase, and Web of Science were searched for observational studies published between January 2020 and July 2023 which report CGM use stratified by any PROGRESS-plus criteria for T1D patients under 26. Reports based in low- or middle-income countries or ≤ 500 participants were excluded. Primary outcomes were the proportion of patients using CGM and HbA1c of CGM users. Quality assessment was performed using the Newcastle-Ottawa Scale. Unadjusted odds ratios were calculated from extracted data, though heterogeneity precluded meta-analysis. The protocol was pre-registered with PROSPERO (CRD42023438139). Results Of the 3,369 unique studies identified, 27 met inclusion criteria. We found decreased CGM use and higher discontinuation for low SES, low education, publicly insured, and minority ethnic, especially black, CYP. These associations were generally robust to adjustment for other sociodemographic variables, suggesting an independent effect. Lower SES inequalities were seen in countries where CGM is reimbursed. Although low SES and minority ethnicity were generally associated with poorer outcomes, there was no significant association between domains of disadvantage and higher HbA1c for CGM users, excepting parental education. Conclusions There are significant SES, ethnic, and education inequalities in CGM use for CYP with T1D, particularly when reimbursement is limited. This is contributing to outcome inequalities. However, evidence suggests CYP benefit equally from CGM use, irrespective of ethnicity and SES. Increasing CGM funding and use is likely to reduce outcome inequalities. Key messages • There are significant SES, ethnic, and education inequalities in continuous glucose monitoring use for young people with T1D. Inequalities are more marked when technology is not reimbursed. • Increasing access to CGM may reduce outcome inequalities, as evidence suggests that young people benefit equally from CGM use, regardless of ethnicity or SES.

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