received : 2011 August 14, accepted : 2011 October 17.
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The number of the lowest quartile of bilirubin subtypes (total bilirubin, direct bilirubin, indirect bilirubin).
Adjusted for age, alanine aminotransferase, gamma-glutamyltransferase, uric acid, body mass index, and alcohol consumption.
Adjusted for age, alanine aminotransferase, gamma-glutamyltransferase, uric acid, body mass index, alcohol consumption and hemoglobin.
Pack-years were calculated as amount (cigarettes/d) x period of smoking (y)/20.