Table 2. Headache-related disability of individuals with migraine in the 2009 Korean Headache Survey and the 2018 Korean Sleep-Headache Survey.

	2009 (n=91)	2018 (n=114)	p‡
Missed activity (days/3 months)
0	80 (87.9)	77 (67.5)	0.001†
1–2	5 (5.5)	27 (23.7)
3–5	5 (5.5)	5 (4.4)
≥6	0 (0.0)	5 (4.4)
No response	1 (1.1)	0 (0.0)
Duration	0.3±1.0	1.1±2.9	0.013*
Reduced productivity (days/3 months)
0	67 (73.6)	92 (80.7)	0.228†
1–2	11 (12.1)	12 (10.5)
3–5	10 (11.0)	8 (7.0)
≥6	0 (0.0)	2 (1.8)
No response	3 (3.3)	0 (0.0)
Duration	1.4±1.4	0.8±2.8	0.679*

Data are n (%) or mean±standard-deviation values.

^*Compared using linear regression analyses while adjusting for sex and age (in years, as a continuous variable), ^†Comparison of the proportion of having missed activity or fewer productivity days using logistic regression analyses while adjusting for age and sex, ^‡Three individuals with migraine did not report the number of days with missed activity, and one individual with migraine did not report the number of days with reduced activity in the 2009 survey. All individuals with migraine reported the number of days with missed activity and reduced activity in the 2018 survey.