Association of lipid parameters with insulin resistance in different glycemic among the elderly population

Objective This study was to analyze the association of lipid parameters with insulin resistance of Chinese elderly population in different glycemic status. Methods Data were from China National Chronic Diseases and Nutrition Survey (2015). A total of 15 535 participants aged 60 and above who had completed survey questionnaire, physical examination, fasting blood biochemistry and insulin measurements were included in this study. According to the American Diabetes Association (2010) criteria, the participants were divided into normal glucose regulation, pre-diabetes, newly-diagnosed diabetes and previously-diagnosed diabetes. Multivariable logistic regression was preformed to assess the effects of lipid parameters on insulin resistance in different glycemic among the elderly population. Results The proportion of normal glucose regulation, pre-diabetes, newly-diagnosed diabetes and previously-diagnosed diabetes was 50.46% (n=7 839), 22.19% (n=3 448), 12.46% (n=1 937) and 14.88% (n=2 311), respectively. The risk of insulin resistance increased with the elevated per quartile of triglycerides (TG) (OR=1.48,95%CI: 1.35-1.62), non-high-density lipoprotein cholesterol (Non-HDL)/HDL-C (OR=1.23, 95%CI: 1.12-1.35) and TG/HDL-C (OR=1.50, 95%CI: 1.36-1.65) and decreased with the elevated per quartile of HDL-C (OR=0.83, 95%CI: 0.76-0.90) after multivariate adjustment among normal glucose regulation participants. As for pre-diabetes participants, the risk of insulin resistance increased with the elevated per quartile of TG (OR=1.26, 95%CI: 1.14-1.39) and TG/HDL-C (OR=1.38, 95%CI: 1.24-1.54) and decreased with the elevated per quartile of HDL-C (OR=0.79, 95%CI: 0.71-0.87). The risk of insulin resistance increased with the elevated per quartiles of TG/HDL-C (OR=1.29, 95%CI: 1.12-1.48) among newly-diagnosed diabetes. As for previously-diagnosed diabetes, the risk of insulin resistance increased with the elevated per quartile of TG, Non-HDL/HDL-C and TG/HDL-C with adjusted OR(95%CI) about 1.28 (1.16-1.41), 1.37(1.21-1.55) and 1.51 (1.33-1.72) repsectivley and decreased with the elevated per quartile of HDL-C (OR=0.77, 95%CI: 0.67-0.87). Conclusion The relationship between lipid parameters and insulin resistance presented diversely in different glycemic status. The elderly with normal glucose regulation and previously-diagnosed diabetes should pay close attention to the change of TG/HDL-C, TG, HDL-C and Non-HDL/HDL-C. As for prediabetes participants, the TG/HDL-C, TG and HDL-C level change should be focused. Key words: Aged; Cross-sectional studies; Blood lipids; Insulin resistance