Verapamil v placebo for prophylactic treatment of episodic cluster headache at 2 weeks§
| Outcome | Verapamil | Placebo | RRR (95% CI) | NNT (CI) |
|---|---|---|---|---|
| §Abbreviations defined in glossary; RRR, NNT, and CI calculated from data in article. | ||||
| ¶Non-response = having a ≤50% reduction in attack frequency. | ||||
| Non-response¶ | 20% | 100% | 80% (53 to 93) | 1 (1 to 2) |