Comparison of characteristics between insulin users and non-insulin users.

Data are presented as median (inter-quartile range) for non-normally distributed variables and no. (%) for categorical variables, unless specified otherwise. The t-test was used for variables with normal distribution, the Wilcoxon signed ranks test for non-normal distributed variables, and the χ2 test for proportions. SBP: systolic blood pressure; BMI: body mass index; TC: total cholesterol; TG: triglycerides; HDL: high-density lipoprotein; LDL: low density lipoprotein.