Thus, efficacy was analyzed in a total of 69 patients. The 69 patients were separated into 29 patients with a PV ≥40 mL (large prostate group; Group L) and 40 patients with a PV <40 mL (small prostate group; Group S). The characteristics of the patients are summarized in . PV was significantly larger in Group L than Group S, and PVR was ....