Type 1 statistical error less than 5% and type 2 statistical error less than 20% were considered. Furthermore, based on previous report, enucleation efficacy using LP-HoLEP was reported as 0.68 + 0.4, 95%CI 0.61-0.75 gm/min (7) with an acceptable non-inferiority margin of 0.2gm/min was considered.