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  • Title: The triglyceride and glucose index (TyG) is an effective biomarker to identify nonalcoholic fatty liver disease.
    Author: Zhang S, Du T, Zhang J, Lu H, Lin X, Xie J, Yang Y, Yu X.
    Journal: Lipids Health Dis; 2017 Jan 19; 16(1):15. PubMed ID: 28103934.
    Abstract:
    BACKGROUND: The triglyceride and glucose index (TyG) has been proposed as a marker of insulin resistance. We aimed to investigate the ability of TyG, through comparing with the predictive value of alanine aminotransferase (ALT), to identify individuals at risk for nonalcoholic fatty liver disease (NAFLD). METHODS: A cross-sectional study was conducted in a Chinese health examination cohort of 10 761 people aged above 20 years. NAFLD was diagnosed by ultrasonography. RESULTS: Compared with the participants in the lowest quartile of TyG, the adjusted odds ratios (ORs) and 95% confidence intervals (CIs) for NAFLD were 1.8 (1.5-2.1), 3.0 (2.5-3.5), and 6.3 (5.3-7.5) for those in the second, the third, and the fourth quartile of TyG, whereas the corresponding ORs (95% CI) for NAFLD were 1.5 (1.3-1.7), 1.9 (1.6-2.2), and 3.1 (2.6-3.7) for the upper three quartiles of ALT. These results suggested that TyG was superior to ALT in association with NAFLD risk. According to the ROC analysis, the optimal cut-off point of TyG for NAFLD was 8.5 and the area under the ROC curve (AUC) was 0.782 (95% CI 0.773-0.790), with 72.2 and 70.5% sensitivity and specificity, respectively. The AUC of TyG was larger than that of ALT (0.715 (95% CI 0.705-0.725), P for difference <0.0001), whereas the largest AUC was obtained when adding TyG to ALT (0.804 (95% CI 0.795-0.812), P for difference <0.0001). CONCLUSIONS: TyG is effective to identify individuals at risk for NAFLD. A TyG threshold of 8.5 was highly sensitive for detecting NAFLD subjects and may be suitable as a diagnostic criterion for NAFLD in Chinese adults.
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