Table 4.

Egger regression results for publication bias

Variable	Egger test	P
24 h pain score	3.449 (3.381, 19.892)	0.014
48 h pain score	3.215 (2.233, 20.055)	0.024
Total rescue analgesia dosage	1.007 (− 4.340, 8.354)	0.388
2 h pain score	5.982 (− 17.523, 48.698)	0.105
4 h pain score	2.498 (− 3.934, 32.673)	0.088
8 h pain score	2.659 (− 0.640, 29.647)	0.056
12 h pain score	1.594 (− 34.984, 76.178)	0.252
72 h pain score	1.772 (− 65.142, 86.259)	0.327
Hospital stay time	0.201 (− 82.330, 84.983)	0.873
VAS 4 h	1.005 (− 401.054, 469.960)	0.498
VAS 8 h	1.552 (− 23.773, 69.056)	0.218
VAS 24 h	2.589 (− 4.826, 46.946)	0.081
VAS 48 h	1.081 (− 44.118, 73.736)	0.393