After 4 months ' treatment , although hemoglobin A1c and 1,5-anhydroglucitol were significantly improved in both groups , only the M-group had significant reductions in insulin resistance index and triglyceride/high-density lipoprotein cholesterol ( TG/HDL-C ; a beneficial index for assessing the presence of small dense low-density lipoprotein , and a marker of atherogenic dyslipidemia ) .