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Median times of achieving sperm concentration at different thresholds. Kaplan-Meier analysis of 223 patients showed median times of achieving sperm concentration more than 0, 5, 10, 15 million/mL. The median time of first spermatogenesis was 15 months. The median and 95% CIs for time to reach 15 million/mL cannot be estimated. CI = confidence interval, M/mL = million/mL.
