Table 2 Characteristics of episodic cluster headache in current, former, and never smokers patients

Age of onset (years)

29.81± 13

11 - 74

29.63 ± 12

11- 65

28.66 ± 13

15 - 74

31.63 ± 17

16 - 72

Length of CH (years)

18.6 ± 11

1 - 49

18.28 ± 9

2 - 40

22.28 ± 12^a

4 - 58

15.52 ± 13

1 - 49

Length of active period (weeks)

10.24 ± 8

1 - 40

12.38 ± 10^b

2 - 40

8.24 ± 7

1 - 40

5.68 ± 4

1 - 20

Maximum number of attacks/day

3.14 ± 1

1 - 8

3.38 ± 1^c

1 - 8

3.04 ± 2

1 - 8

2.47 ± 1

1 - 6

N. of active period

N.

%

N.

%

N.

%

N.

%

1/year

38

19

26

22

0

0

12

31

>1/year

27

13.5

17

14

4

10

6

16

<1/years

72

36

43

36

17

40

12

32

Erratic

63

31.5

34

28

21^d

50

8

21