Figure 2From: Meta-analysis of tumor necrosis factor alpha -308 polymorphism and knee osteoarthritis risk Meta-analysis of TNF-α -308 polymorphism and OA risk: (A) dominant genetic model analysis; (B) recessive genetic model analysis (C) A allele vs. G allele analysis. Note: No AA genotype in Romero’s study and Valle’s study, therefore, these two studies were excluded in the recessive model analysis.Back to article page