Influence analysis for TNF-α -308 polymorphism in the overall analysis: (A) dominant model analysis; (B) recessive model analysis; (C) A allele vs. G allele analysis. These figures show the influence of individual studies on the pooled ORs. The middle vertical axis represents the overall ORs and the two vertical axes represent its 95% CIs. Open circles represent the pooled OR when the selected study is omitted in this meta-analysis. The two ends of the dotted lines indicate the 95% CI.