Fig. 3

Funnel plots of outcomes. Publication bias assessment. Funnel plots of outcomes, Egger’s linear regression test was used to evaluate asymmetry, and P < 0.05 was set as the level of significance. (a) Graft success rate, p = 0.288; (b) Operation time, p = 0.016; (c) Immediate postoperative pain, p = 0.178; (d) Pain one day after surgery, insufficient observations for Egger’s test; (e) Air conduction, insufficient observations for Egger’s test; (f) Bone conduction, insufficient observations for Egger’s test; (g) Air-bone gap, p = 0.522; (h) Air-bone gap reduction, insufficient observations for egger’s test