Comparison 5. Methodologic quality: low (<3) vs high (=> 3).

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Pain at end of treatment	4	169	Mean Difference (IV, Fixed, 95% CI)	‐1.05 [‐1.58, ‐0.53]
1.1 Low quality (<3)	2	107	Mean Difference (IV, Fixed, 95% CI)	‐1.39 [‐2.23, ‐0.56]
1.2 High quality (=> 3)	2	62	Mean Difference (IV, Fixed, 95% CI)	‐0.84 [‐1.51, ‐0.16]