There was no significant difference between the two groups in the maximum urinary flow rate ( Q max ) , postvoid residual volume ( PVR ) , international prostate symptom score ( IPSS ) , or quality-of-life score ( QOL score ) at 1 month after surgery ( p = 0.56 , p = 0.346 , p = 0.536 and p = 0.145 , respectively ) .