Fig. 5
From: A meta-analysis of MMP-9 promoter −1562 C/T polymorphism on susceptibility of chronic periodontitis
Begg’s funnel plot of the MMP-9 promoter −1562 C/T polymorphism and CP risk in different contrast models. A: T versus C, B: TT versus CC, C: CT versus CC, D: dominant genetic model (TT + CT vs. CC), and E: recessive genetic model (TT vs. CT + CC)