Patients in the preoperative group reported lower pain Numeric Ranking Scale values compared with those in the control group ( net difference @ points ; @ % confidence interval -LSB- CI -RSB- , @-@ @ at @ hours , @-@ at @ hours , and @-@ at @ hours ; p = @ ) Patients in the preoperative group consumed significantly less morphine than did those in the control group ( net difference @ mg ; @ % CI , @-@ ; p = @ ) .