Table 1 Self-reported efficacy of complementary and alternative medicine in people with primary and secondary chronic headache

23 (15–35) (15/65)

16 (8–27) (9/58)

25 (7–59) (2/8)

0 (0–43) (0/5)

20 (14–27) (26/133)

32 (17–52) (8/25)

27 (10–57) (3/11)

41 (22–64) (7/17)

0 (0/1)

32 (20–46) (15/47)

23 (14–34) (14/62)

28 (17–42) (13/47)

25 (1/4)

50 (1/2)

26 (19–34) (29/113)

30 (16–51) (7/23)

38 (14–69) (3/8)

43 (21–67) (6/14)

-

38 (24–53) (15/40)

17 (1–37) (4/23)

18 (6–41) (3/17)

0 (0/2)

0 (0/3)

16 (8–29) (7/44)

13 (2–47) (1/8)

25 (1/4)

0 (0/7)

-

6 (1–28) (1/16)

15(4–42) (2/13)

17 (3–56) (1/6)

-

0 (0/1)

15 (5–36) (3/20)

33 (1/3)

0 (0/1)

-

-

33 (1/3)

23 (17–32) (25/109)

28 (20–37) (26/94)

25 (7–59) (2/8)

25 (1/4)

25 (20–31) (53/211)

43 (29–58) (17/40)

28 (13–51) (5/18)

41 (23–61) (9/22)

33 (1/3)

38 (27–49) (27/72)

25 (1/4)

0 (0/3)

-

0 (0/1)

25 (7–59) (2/8)

0 (0/1)

-

33 (1/3)

-

33 (1/3)

29 (12–55) (4/14)

41 (22–64) (7/17)

-

-

35 (21–53) (11/31)

50 (1/2)

0 (0/1)

0 (0/1)

-

25 (1/4)

39 (31–47) (51/132)

42 (33–51) (46/110)

33 (12–65) (3/9)

33 (10–70) (2/6)

40 (34–46) (101/253)

51 (36–66)(21/41)

37 (19–59) (7/19)

50 (33–67) (15/30)

33 (1/3)

46 (36–57) (38/82)

2.3 (1–6)

2.3 (1–8)

2.6 (1–4)

3.2 (1–7)

2.4 (1–8)

2.7 (1–6)

2.5 (1–6)

2.4 (1–5)

1.3 (1–2)

2.5 (1–6)