Fig. 2

Incidence rate (%) of non-alcoholic fatty liver disease (NAFLD) by quartiles of the serum prolactin (PRL) levels at baseline. The quartile ranges of Q1, Q2, Q3, and Q4 of serum PRL levels were < 6.65, 6.65–8.68, 8.68–11.90, and > 11.90 ug/L in males and < 5.69, 5.69–8.75, 8.75–11.28, and > 11.28 ug/L in females. Panel a shows that the incidence rate of NAFLD decreased with the increase of quartile of PRL concentration in male patients (P—trend = 0.046). Panel b shows that the incidence rate of NAFLD decreased with the increase of quartile of PRL concentration in female patients (P—trend = 0.025)