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Recurrence rates according treatment group.
| Treatment | Recurrence Rate n/N (%) |
| RI | 11/22 (50%) |
| RI + RO | 6/39 (15.4%) |
| RI + TA | 2/26 (7.7%) |
| P value | P < 0.01 for RI vs RI + RO P < 0.01 for RI vs RI + TA P = NS for RI + RO vs RI + TA |
RI: rizatriptan; RO: rofecoxib; TA: tolfenamic acid; n: attacks where recurrence were observed; N: number of treated attacks.
