Compared with NSM , the BKP group had greater improvements in SF-36 physical component summary ( PCS ) scores at 1 month ( 5.35 points ; 95 % CI , 3.41-7 .30 ; P < 0.0001 ) and when averaged across the 24 months ( overall treatment effect 2.71 points ; 95 % CI , 1.34-4 .09 ; P = 0.0001 ) .
