The total hospital stay ( days : 32.0 22.5 , 26.8 7.0 , 30.4 21.4 ) and nosocomial infection rate [ 91.1 % ( 51156 ) , 84.0 % ( 42/50 ) , 90.4 % ( 4 7/52 ) J were similar among A , B , C groups ( all P > 0.05 ) .