Compared with monopolar transurethral bladder tumor resection , bipolar resection was associated with a significantly lower incidence of severe bladder injury ( 0.3 % vs 0.6 % , OR 0.57 ) , other complications ( 4.6 % vs 5.8 % , OR 0.78 ) , slightly shorter postoperative stay ( mean 6.4 vs 6.7 days , difference -3.3 % ) and slightly lower total costs ( mean $ 4,628 vs $ 4,727 ; difference -1.1 % , all p < 0.05 ) .