A Cochrane review [Abstract] 1 included 72 studies with a total of 7355 subjects. Gonadotrophin-releasing hormone analogues (GnRHas) compared with placebo were more effective at symptom relief at three months in 1 trial (n=87), reported as pelvic pain scores (RR 2.14; 95% CI 1.41 to 3.24, dysmenorrhoea scores (RR 2.25; 95% CI 1.59 to 3.16, and pelvic tenderness scores (RR 2.28; 95% CI 1.48 to 3.50. More adverse events were reported in the GnRHa group. There was no statistically significant difference between GnRHas and danazol in 1 small trial.
Comment: The quality of evidence is downgraded by risk of bias (unclear allocation concealment or blinding in half of the studies) and by imprecise results.
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