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Figure 4: Followup time required to achieve different thresholds of sperm concentration between subgroups with BTV ≥4 ml and <4 ml. (Kaplan–Meier analysis). (a) Cumulative percentage of patients in the hCG/TU subgroups with BTV ≥4 ml (n = 27) and <4 ml (n = 23) to achieve sperm concentration >0 ml^{−1} (P = 0.004). (b) Cumulative percentage of patients in the hCG/TU subgroups to achieve sperm concentration ≥15 × 10^{6} ml^{−1} (P = 0.007). (c) Median sperm concentration with interquartile range in the hCG/TU subgroups with BTV ≥4 ml and <4 ml (P = 0.047). (d) Cumulative percentage of patients in the hCG subgroups with BTV ≥4 ml (n = 17) and <4 ml (n = 32) to achieve sperm concentration >0 ml^{−1} (P = 0.098). (e) Cumulative percentage of patients in the hCG subgroups with BTV ≥4 ml and <4 ml to achieve sperm concentration ≥15 × 10^{6} ml^{−1} (P = 0.049). (f) Median sperm concentration with interquartile range in the hCG subgroups (P = 1.000). hCG: human chorionic gonadotropin; BTV: basal testicular volume; TU: testosterone undecanoate. 
