Left shoulder pain did not appear at 0 h and 2 h in both groups , while at 12 h and 24 h postoperatively , the NRS scores of group 1 were lower than those of group 2 [ 0 ( 0 , 1 ) vs. 0 ( 0 , 8 ) , P = 0.026 ; 0 ( 0 , 4 ) vs. 2 ( 0 , 9 ) , P = 0.014 ] .