Forest plot of IL-6 -572G/C polymorphisms associated with hepatitis B virus related liver diseases risk for subgroup analysis of IC, CHB, LC, and HCC as compared with healthy control (HC). A: Allelic model, G vs C; B: Homozygous model, GG vs CC; C: Heterozygous modle, GG vs GC; D: Recessive model, GC + GG vs CC; E: Dominant model, GC + CC vs GG. The results indicated that IL-6 -572G/C exhibited the obvious association with CHB risk in all models.