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Figure 1 Frequency distributions of (A) insulin resistance as assessed by the HOMA model and (B) serum levels of HDL-C in 54 pairs of cases with coronary heart disease (solid bars) and controls (open bars). The frequency distributions of HOMA insulin resistance and HDL-C were each significantly different between the two groups (chi-square = 19.2 and 23.8, df = 7, p < 0.01). The proportion of cases in each tertile of HOMA insulin resistance (Fig. 1A) and HDL-C (Fig. 1B) is also shown, along with their corresponding mean values ± SD. Arrows on the X axis identify the tertile values (solid arrows on the left and right, 0.96 and 1.43 for HOMA insulin resistance and 45 and 56 mg/dl for HDL-C) and the median value (open arrows in the middle, 1.21 for HOMA insulin resistance and 53 mg/dl for HDL-C) of control subjects.
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