On intention-to-treat analysis , both the PKEP and OP groups had equivalent Qmax ( 25.27.0 ml/s vs 25.77.6 ml/s , respectively ; p = 0.688 ) , International Prostate Symptom Score ( 3.5 [ 2-5 ] vs 3 [ 2-5 ] , respectively p = 0.755 ) , quality of life ( 2 [ 1-3 ] vs 2 [ 1-3 ] , respectively ; p = 0.950 ) , and postvoid residual urine ( 20 [ 9-33 .5 ] vs 16.5 [ 7-31 ] ml , respectively ; p = 0.469 ) at 72 mo postoperatively .