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Research Article: Association between islet ?-cell function and time in range in patients with type 2 diabetes mellitus: a retrospective cross-sectional study

Date Published: 2026-08-05

Abstract:
Impaired islet ? -cell function is the core mechanism underlying type 2 diabetes mellitus (T2DM). This study investigated the association between islet ? -cell function and time in range (TIR) in patients with T2DM, providing a reference for individualized clinical treatment. This retrospective cross-sectional observational l study included 1,160 patients with confirmed T2DM. Participants underwent continuous glucose monitoring (CGM). TIR >70% was defined as achieving the glycemic target. Subjects were divided into three groups based on TIR levels (<70%, 70%–84%, and ?85%). The ? -cell function index HOMA 2– ? was calculated using the Homeostasis Model Assessment 2 as the core research indicator. The high TIR group had significantly higher HOMA2- ? (P < 0.001). Multiple linear regression analysis showed a robust positive correlation between HOMA2- ? and TIR after adjusting for covariates ( ? = 0.402, 95% CI: 0.358–0.447, P < 0.001). Restricted cubic spline (RCS) analysis revealed a significant nonlinear relationship between HOMA2- ? and TIR (P for nonlinearity < 0.001). TIR increased with rising HOMA2- ? , but the rate of increase gradually slowed. Specifically, when HOMA2- ? increased from approximately 10% to 100%, the predicted TIR rose rapidly from about 38% to approximately 96%, representing an increase of 58%. Sensitivity analysis using HOMA2- ? calculated from fasting C-peptide instead of fasting insulin yielded consistent conclusions. A significant, nonlinear association exists between islet ? -cell function HOMA 2– ? and TIR. TIR levels increase progressively with higher HOMA2- ? . Although the cross-sectional design precludes causal inference, these findings provide important reference values for clinical decision-making.

Introduction:
Type 2 diabetes mellitus (T2DM), as one of the chronic diseases with the highest global incidence, has become a major public health challenge. According to the International Diabetes Federation (IDF), the estimated global prevalence of diabetes mellitus (DM) among adults aged 20–79 years was 10.5% in 2021, and it is projected to rise to 12.2% by 2045 ( 1 ). China currently has the largest number of people with diabetes in the world, accounting for more than one-quarter of the global diabetic population ( 2 ). It…

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