Comparison 7. Subgroup analysis: traditional and COX‐2 NSAID vs Placebo.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Pain (VAS)	4	1199	Mean Difference (IV, Random, 95% CI)	‐18.06 [‐23.11, ‐13.00]
1.1 traditional NSAIDs	4	850	Mean Difference (IV, Random, 95% CI)	‐16.51 [‐20.84, ‐12.17]
1.2 COX‐2 NSAIDs	2	349	Mean Difference (IV, Random, 95% CI)	‐21.68 [‐35.94, ‐7.42]