Fig. 2
From: Association of the MTHFR 677C>T and 1298A>C polymorphisms and male infertility risk: a meta-analysis
Forest plot of male infertility risk associated with MTHFR 677C > T polymorphism [a for TT vs. CC; b for TC vs. CC; c for TT + TC vs. CC; d for TT vs. TC + CC]. The squares and horizontal lines correspond to the study-specific OR and 95% CI. The area of the squares reflects the weight (inverse of the variance). The diamond represents the summary OR and 95% CI