Fig. 3

Forest plots for meta-analysis of pooled odds ratio (OR) of 5T allele in patients with congenital unilateral absence of the vas deferens (CUAVD). Summary ORs and their 95% confidence intervals (CIs) were calculated by Mantel–Haenszel method and are indicated with diamonds. Solid squares indicate the OR of each study, with the square size directly proportional to the weight and horizontal lines representing 95% CIs. Dotted vertical line indicates the overall estimate, and solid black line indicates the null effect (OR = 1). a CUAVD vs. normal controls. b CUAVD vs. non-CAVD infertile males