Aims: This study investigated the association of capillary blood glucose (CBG)-assessed time in range (TIR) (3.9-10.0 mmol/L) with insulin sensitivity and islet b-cell function. Materials and Methods: We recruited 455 patients with type 2 diabetes mellitus. Seven-point glucose-profile data (pre-and 120 min post-main meals, bedtime) were collected over three consecutive days. Plasma glucose and serum insulin concentrations were measured at 0, 60, and 120 min after a 100 g standard steamed bread meal test. The homeostasis model assessment of insulin resistance (HOMA-IR) and Matsuda index were computed to evaluate insulin resistance. The HOMA of b-cell function (HOMA-b) and the area under the curve between insulin and blood glucose (IAUC 0-120 /GAUC 0-120 ) were used to estimate b-cell function. Results: TIR was positively correlated with the 60 and 120 min insulin values, IAUC 0-120 , the Matsuda index, HOMA-b, and IAUC 0-120 /GAUC 0-120 (r s : 0.154, 0.129, 0.137, 0.194, 0.341, and 0.334, respectively; P < 0.05) but inversely correlated with HOMA-IR (r s : -0.239, P < 0.001). After adjusting for confounders, multinomial multiple logistic regression analysis revealed that the odds ratios (ORs) of achieving the target time in range (>70%) increased by 12% (95% confidence interval [CI]: 3-21%), 7% (95% CI: 1-14%), 10% (95% CI: 5-16%), and 45% (95% CI: 25-68%) for each 10 mIU/L increase in the 60 and 120 min insulin values, 10 unit increase in HOMA-b, and unit increase in IAUC 0-120 /GAUC 0-120 , respectively (P < 0.05). Nevertheless, the OR decreased by 10% (95% CI: 1-18%) for each unit increase in HOMA-IR (P < 0.05). Conclusions: Insulin resistance and islet b-cell function are related to capillary blood glucose-assessed TIR.Jingwen Ye and Jiajin Deng contributed equally to this work.

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