TGFB1 and hepatitis C virus infection: The forest plot in Figure 3 presents the statistical analysis of the impact of TGF-β1 polymorphism and levels on the incidence of hepatic cirrhosis and hepatitis C. The OR was found to be 0.65 with a 95% CI ranging from 0.55 to 0.76, indicating a statistically significant impact of TGF-β1 polymorphism and levels on the incidence of the disease.