| Group B (n = 48) | Group M (n = 48) | P value |
Intra-operative fentanyl (µg) consumption | 104.17 ± 20.19 | 102.08 ± 14.43 | 0.56 |
Time of 1st request of analgesia (hours) | 6.48 ± 1.11 | 7.29 ± 1.34 | 0.002* |
Total pethidine consumption in the first 24 h (mg) post-operative | 43.75 ± 11.18 | 30.31 ± 8.84 | <0.001** |