Table 3 Lost useful time because of headache in the preceding 4 weeks, overall and by headache type (N = 2,344)

All headache^b

1,726

2.6 ± 3.2

0.7 ± 1.5

1.0 ± 1.8

245 (14.2)

Migraine^b

900

2.8 ± 2.9

0.9 ± 1.7

1.2 ± 1.8

154 (17.1)

Tension-type headache

477

2.0 ± 2.3

0.5 ± 1.1

0.7 ± 1.3

47 (9.9)

All headache on ≥ 15 days/month

29

16.1 ± 2.6

2.4 ± 2.7

5.0 ± 5.2

10 (34.5)

Undifferentiated headache

298

1.8 ± 2.3

0.4 ± 1.3

0.6 ± 1.1

31 (10.4)