Relation of time off-work to the duration of headache in episodic and chronic migraine
| Migraine type | Time off-work (days) * Duration (hours) | |
|---|---|---|
| r | P | |
| Episodic migraine < 15 days (n = 110) | –0.170 | 0.076 |
| Chronic migraine ≥ 15 days (n = 97) | –0.179 | 0.080 |
| Total (n = 207) | 0.058 | 0.403 |
r: Spearman’s correlation coefficient