fig1

Figure 1. Flowchart of participant selection for the 1:2 matched case-control study. Abnormal energy intake was defined as > 3,500 or < 600 kcal/day for females and > 4,200 or < 800 kcal/day for males. Controls were individually matched to cases by age and gender. FFQ: Food frequency questionnaire; HBV: hepatitis B virus; PLC: primary liver cancer.