The mean Qmax for 42 patients without preoperative urinary retention was 5.42 ± 1.74 (1.8 - 8.9) mL / s, after the 1st - month Qmax was 15.2 ± 3.25 (9 - 21.6) mL / s, after the 3rd - month was 17.63 ± 2.62 (12.5 - 25.3) mL/s.