Figure 1

The incidence rates of NAFLD according to serum direct bilirubin levels quartiles.
The quartiles of serum direct bilirubin levels were calculated by sex respectively and the cutoff values of serum direct bilirubin quartiles were <3.7, 3.7–4.5, 4.5–5.6 and >=5.6 umol/L for males and <2.9, 2.9–3.6, 3.6–4.5 and >=4.5 umol/L for females respectively. **p < 0.001 *p < 0.05.