Figure 3. Recovery of spermatogenesis after cessation of treatment with hormonal male contraceptive regimens modified after an integrated re-analysis of over 90% of all reported studies (234). Data is plotted as a Kaplan-Meier survival plot of the increasing proportion of men recovering to various thresholds over time since last treatment. The data of last treatment is defined as the time elapsed from the end of the last treatment cycle, that is the latest date of the first missed treatment dose. The thresholds are a sperm concentration of 3, 10 or 20 million sperm per mL in the ejaculate or a return to their own pre-treatment baseline sperm concentration. The median time to achieving each threshold is tabulated together with its 95% confidence interval.