Patients in diclofenac group had significantly higher fentanyl consumption ( 674.85 115.58 g ) compared with pregabalin group ( 601.87 129.57 g ) ( 95 % confidence interval [ CI ] = 34.8-120 .7 ) and gabapentin group ( 612.29 105.12 g ) ( 95 % CI = 14.9-170 .5 ) .