Table 6 1-year prevalences (% [95% CI]) of all headache, migraine, tension-type headache and undifferentiated headache in this and other studies using the same questionnaire [5]

Zambia (this study) (N = 2,089)^a

85.8

[84.3–87.3]

53.2

[51.1–55.3]

12.1

[10.7–13.5]

14.8

(13.3–16.3)

Ethiopia [6] (N = 2,344)^a

72.8

[71.0–74.6]

38.6

[36.6–40.6]

19.9

[18.3–21.5]

12.3

[11.0–13.6]

Turkey [17] (N = 7,068)^a

73.7

[59.8–62.8]

26.7

[26.7–29.4]

12.9

[15.8–18.0]

29.2

[6.0–7.6]

Lithuania [18] (N = 2,505)^a

76.6

[74.9–78.3]

21.4

[19.8–23.0]

25.6

[23.9–27.3]

24.0

[22.3–25.7]

Mongolia [19] (N = 4,266)^a

59.4

[57.9–60.9]

27.3

[26.0–28.6]

16.1

[15.0–17.2]

6.6

[5.9–7.4]

Austria [25] (age range 10–18 years) (N = 3,386)^b

75.7

[74.3–77.1]

24.2

[22.8–25.6]

21.6

[20.2–23.0]

26.1

[24.6–27.6]