Relation of time off-work to the duration of headache in episodic and chronic migraine

Migraine typeTime off-work (days) * Duration (hours)
rP
Episodic migraine < 15 days (n = 110)–0.1700.076
Chronic migraine ≥ 15 days (n = 97)–0.1790.080
Total (n = 207)0.0580.403

r: Spearman’s correlation coefficient