Comparison 8. Mefenamic acid versus naproxen.

Outcome or subgroup title	No. of studies	No. of participants	Statistical method	Effect size
1 Menstrual blood loss (mL/cycle)	2	61	Mean Difference (IV, Fixed, 95% CI)	21.00 [‐5.85, 47.85]
2 Number of days' bleeding	1	35	Mean Difference (IV, Fixed, 95% CI)	‐0.40 [‐1.59, 0.79]
3 Total adverse events	1	35	Peto Odds Ratio (Peto, Fixed, 95% CI)	0.12 [0.01, 2.00]
4 Gastrointestinal adverse events	1	35	Peto Odds Ratio (Peto, Fixed, 95% CI)	0.24 [0.06, 0.87]
5 Central nervous system adverse events	1	35	Peto Odds Ratio (Peto, Fixed, 95% CI)	1.40 [0.34, 5.73]