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| Number of triggers | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | Total |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Headache days | 327 | 305 | 247 | 139 | 56 | 18 | 3 | 2 | 1 | 1 | 1099 |
| No headache | 2587 | 351 | 267 | 182 | 76 | 14 | 1 | 0 | 1 | 1 | 3480 |
| Total | 2914 | 656 | 514 | 321 | 132 | 32 | 4 | 2 | 2 | 2 | 4579 |
