[Correlation of Ureaplasma urealyticum and Chlamydia trachomatis infections with male sterility: a meta-analysis of randomized control trials]. 
To evaluate the correlation of Ureaplasma urealyticum (Uu) and Chlamydia trachomatis (Ct) infections with male sterility.  Data from CBMA and CNKI were searched and studies were made for the correlation of Uu and Ct infections with male sterility by retrieval strategy worked out according to the Collaborative Review Group search strategy.  The results were expressed as odds ratio (OR) and 95% confidence intervals (95% CI).  The results of 28 clinical controlled trials from 1994 to 2005 were analyzed by software RevMan 4.2.  Odds ratio (OR) was applied to the evaluation of the correlation between Uu infection and male sterility.  Eighty-eight relative trials were retrieved, of which 28 were included in the Meta-analysis.  The combined ORs of Uu and Ct infections to male sterility were OR(Uu): 4.73 (95% CI: 3.77-5.94) and OR(Ct): 4.59 (95% CI: 3.24-6.50).  Uu and Ct infections are very important risk factors of sterility in Chinese men.