Their were significant differences between observation and control groups in intraoperative blood loss ( @ vs @ , P = @ ) , pain ( @ h after the surgery : @ vs @ , P = @ ; at first dressing change : @ vs @ , P = @ ; first defecation : @ vs @ , P = @ ) , urine retention ( n = @ vs n = @ , P = @ ) , anal pendant expansion after the surgery ( @ vs @ , P = @ ) , operation time ( @ min vs @ min , P = @ ) , and the length of hospital stay ( @ d vs @ d , P = @ ) .