| Methods | D: parallel C: unclear B: unblinded WD: 20/40 J: 2‐0‐1 DU: ‐/6m/‐ | |
| Participants | N: 40/20 D: migraine C: Ad Hoc F: 89% A: 23‐47 years DU: not reported S: probably neurological university outpatient clinic in the US | |
| Interventions | P: 120‐180 mg C: Nifedipine 60‐90 mg | |
| Outcomes | R: 12/13 vs. 6/7 (subjective rating of at least 50% improvement) F: 2.2 (sd 3.2) vs. 1.5 (4.0) attacks/month during months 4‐6 AU: not reported HI: not reported AEs: 15/20 vs. 20/20 Dropouts‐AEs: 5/20 vs. 13/20 V: (+) | |
| Notes | Very high dropout rate | |
| Risk of bias | ||
| Bias | Authors' judgement | Support for judgement |
| Allocation concealment (selection bias) | Unclear risk | B ‐ Unclear |
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