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Table 3 Correlation coefficients between indices of insulin resistance and glucose infusion rate during the meal tolerance test

From: 20/(fasting C-peptide × fasting plasma glucose) is a simple and effective index of insulin resistance in patients with type 2 diabetes mellitus: a preliminary report

Index All patients GIR 5–10 mg·kg–1·min–1
(n= 15) (n = 10)
  r P r P
HOMA-IR −0.74 < 0.005 −0.49 0.15
ISI 0.66 < 0.01 0.20 0.56
QUICKI 0.76 < 0.001 0.50 0.14
F-IRI −0.66 < 0.01 −0.42 0.22
ΣIRI(0–180 min) −0.59 < 0.05 −0.26 0.54
F-CPR −0.71 < 0.01 −0.75 < 0.05
F-CPR × FPG −0.81 < 0.0005 −0.83 < 0.005
1/(F-CPR × FPG) 0.83 < 0.0005 0.90 < 0.0005
20/(F-CPR × FPG) 0.83 < 0.0005 0.90 <0.0005
CPI −0.52 < 0.05 −0.62 0.06
CLIX 0.40 0.12 0.23 0.52
P-CPR × PPG −0.58 < 0.05 −0.48 0.16
(F-CPR + P-CPR) × (FPG + PPG) −0.68 < 0.005 −0.63 < 0.05
BMI −0.54 < 0.05 −0.27 0.45
Waist circumference −0.11 0.69 −0.13 0.71
TG/HDL −0.11 0.67 −0.32 0.35
Plasma adiponectin 0.52 < 0.05 0.65 < 0.05
  1. Correlation coefficients were determined using Pearson’s product moment correlation coefficient test.
  2. GIR glucose infusion rate, HOMA-IR homeostasis model assessment of insulin resistance, ISI insulin sensitivity index, QUICKI quantitative insulin sensitivity check index, F-IRI fasting immunoreactive insulin, F-CPR fasting C-peptide immunoreactivity, FPG fasting plasma glucose, CPI C-peptide index, P-CPR 2-h postprandial C-peptide immunoreactivity, PPG 2-h postprandial plasma glucose, BMI body mass index, TG triglyceride, HDL-C high-density lipoprotein cholesterol.