Fig. 3
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 1298A/C polymorphism [a for CC vs. AA; b for CA vs. AA; c for CC + CA vs. AA; d for CC vs. CA + AA]. 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