Comparison 2. Two types of surgical anchorage.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Mesiodistal movement of the upper first permanent molar	1	25	Mean Difference (IV, Random, 95% CI)	1.62 [0.98, 2.26]
2 Success of anchorage device	4	224	Risk Ratio (M‐H, Fixed, 95% CI)	1.06 [0.94, 1.19]
2.1 Early versus delayed loading	2	36	Risk Ratio (M‐H, Fixed, 95% CI)	1.0 [0.83, 1.20]
2.2 Single versus dual mini‐screw implants	1	76	Risk Ratio (M‐H, Fixed, 95% CI)	1.01 [0.84, 1.22]
2.3 Pre‐drilling versus self drilling	1	112	Risk Ratio (M‐H, Fixed, 95% CI)	1.12 [0.91, 1.38]
3 Duration of space closure	1	25	Mean Difference (IV, Random, 95% CI)	‐2.19 [‐6.35, 1.97]