Comparisons of demographic and clinical characteristics of the two study populations according to age.

Note: The numbers in the parenthesis presented after each variable indicate the number of patients with data for the elderly and younger groups of patients, respectively.Abbreviations: BUN, blood urea nitrogen; cART, combination antiretroviral therapy; eGFR, estimated glomerular filtration rate; HbA1C, glycosylated hemoglobin, HDL, high-density lipoprotein cholesterol; IDU, injecting drug use; LDL, low-density lipoprotein cholesterol; MSM, men who have sex with men; PI, protease inhibitor; SD, standard deviation; TDF, tenofovir disoproxil fumarate; TG, triglyceride.