Assessment of postoperative analgesia by study
| Study | Variable assessed for pain evaluation | Significant findings in intermittent bolus group (vs continuous infusion) |
| Taboada et al 4 | VRS | VRS scores at 6, 8, and 12 hours postoperatively lower. |
| Taboada et al 5 | VRS | No difference between groups. |
| Hillegass et al 6 | VAS | VAS score afternoon of POD 1 lower; otherwise, no difference. |
| Thapa et al 7 | VAS | Mean VAS score at 4, 6, 8, and 12 hours at rest and at 4, 6, 8, 12, and 24 hours on flexion lower. |
| Wang et al 8 | NRS | NRS score at 8, 12, 24, 36 hours postoperatively lower. |
| Jæger et al 9 | VAS | No difference between groups. |
| Mezzatesta et al 10 | Pain score, not specified | No difference between groups. |
| Hamdani et al 11 | VRS | No difference between groups. |
| Oxlund et al 12 | VAS | No difference between groups. |
| Català13 | VAS | VAS scores at 4, 10, 20, and 48 hours higher at rest and on movement. |
| Fibla14 | VAS | VAS at 48 and 72 hours lower; otherwise, no difference. |
| Rao Kadam et al 15 | NRS | No difference between groups. |
| Holmes et al 16 | VAS | No difference between groups. |
NRS, Numeric Rating Scale; POD, postoperative day; VAS, Visual Analog Scale; VRS, Verbal Rating Scale.