There is increasing recognition that older onset type 1 diabetes (T1D) is not uncommon. Although CGM use is rising dramatically among those with T1D, little is known regarding its use and benefits within this older T1D population. To address these questions, we identified new CGM users (new CGM sensor prescriptions for T1D developing after military enrollment) and non-users (T1D receiving care and glucose strips from the VHA) during the years 2015-2020 and used national VHA healthcare data and ICD-9/ICD-diagnostic codes from visit encounters to compare baseline characteristics, change in glucose control and new emergency (ER) or hospital admissions. Linear mixed models and Cox proportional models (with propensity score overlap weighting) , were used to compare pre/post changes in HbA1c, and time to acute admissions, respectively. Compared with 4732 nonCGM users, CGM users (n=5,143) had similar HbA1c levels but differed in many ways at initiation of CGM, including: being significantly younger (59 vs. 65 years) , higher proportion White (83 vs. 75%) , and more frequently using glucagon (36 vs. 12 %) , short-acting insulin (99 vs. 86%) and insulin pumps (54 vs.7%) . After propensity overlap weighting, all characteristics were nearly identical between groups. Initiation of CGM was associated with reduced HbA1c levels (- 0.2 and -0.26% at 6 and 12 months (p’s< 0.001) compared with nonCGM users. Similarly, CGM users also had greater declines in risk for total hospitalizations (HR = .88; CI 0.79-0.98) and hypoglycemic (HR = .69; CI 0.53-0.90) and hyperglycemic (HR = .77; CI 0.64-0.94) related ER visits/hospitalizations (all p’s < 0.02) . In this large national study of CGM initiation in older T1D patients, CGM use was linked with improved glucose control as well as reduced ER and/or hospital admissions for hypoglycemia, hyperglycemia or any cause.


J.Zhou: Research Support; Dexcom, Inc. M.Newell: Research Support; Dexcom, Inc. S.Rivas: None. X.Zhou: None. G.J.Norman: Employee; Dexcom, Inc. P.Reaven: Research Support; AstraZeneca, Dexcom, Inc.


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