VAS scores were lower 30 min postoperatively in the HD group ( 1.29 1.67 , 95 % CI 0.64-1 .94 ) compared with the RD group ( 2.21 1.67 , 95 % CI 1.57-2 .84 ) ( t = 3.427 , p = 0.0043 , RD group vs. HD group ) .