After stratifying patients according to prostate volume , there was no significant difference between the two treatment groups with regard to urethral stricture rates in patients with a prostate volume 70mL ( 3.8 % in M-TURP vs 3.8 % in TURis ) , but in the TURis group there was a significantly higher urethral stricture rate compared with the M-TURP group in patients with a prostate volume > 70mL ( 20 % in TURis vs 2.2 % in M-TURP ; P = 0.012 ) .