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Lipids, Lipoproteins, and Cardiovascular Risk Factors |
1 Health Screening Center, 2
Department of Occupational Medicine, and 3
Department of Family Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
4 Department of Radiology, Asan Medical Center, University of Ulsan College of Medicine, Ulsan, Korea.
aAddress correspondence to this author at: Kangbuk Samsung Hospital, 108 Pyung dong, Jongro-Gu, Seoul, Korea 110-746. Fax 82-2-2001-2626; e-mail sh703.yoo{at}samsung.com.
Background: In nonalcoholic fatty liver disease (NAFLD), increased alanine aminotransferase (ALT) concentrations are considered to be a consequence of hepatocyte damage. We performed a prospective study to examine the association between ALT within its reference interval and risk for subsequent development of NAFLD.
Methods: The study cohort comprised 5237 healthy men without diagnosed NAFLD and without increases of either ALT (
35 U/L) or
-glutamyltransferase (GGT;
40 U/L) above the reference intervals. We assessed alcohol intake via self-reporting (questionnaire) and performed biochemical tests for liver and metabolic function and abdominal ultrasonography. We used the Cox proportional hazards model to calculate the adjusted hazard ratios (aHRs) in the model for NAFLD.
Results: During 13 276.6 person-years of follow-up over a 4-year period, 984 new incident cases of NAFLD developed. We adjusted for age, weight change, body mass index, glucose, blood pressure, triglycerides, HDL cholesterol, smoking, alcohol consumption, regular exercise, homeostasis model assessment of insulin resistance, C-reactive protein, and incident diabetes. Compared with an ALT concentration of <16 U/L, aHR values (95% confidence intervals) for ALT concentrations were 1.53 (1.181.98), 1.66 (1.292.13), 1.62 (1.262.08), and 2.21 (1.732.81) for ALT concentrations of 1618, 1921, 2225, and 2634 U/L, respectively. This relationship remained significant even among normal-weight participants who were still within the reference interval of ALT and GGT at all follow-up examinations.
Conclusions: In apparently healthy, nondiabetic Korean men, increased ALT concentration, even within the reference interval, was an independent predictor of incident NAFLD.
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