Table 3 Division of participants into smokers and non-smokers and into episodic and chronic cluster headaches

Smokers

Non-Smokers

Frequency

78 (59%)

55 (41%)

Statistic

Gender (male / female)

61 (78%) / 17 (22%)

39 (71%) / 16 (29%)

χ² = 0.92

p = 0.34

Age [y], mean ± SD

41.3 ± 10.2

43.7 ± 10.8

p = 0.20

CH – Type (episodic / chronic)

57 (73%) / 21 (27%)

41 (75%) / 14 (25%)

χ² = 0.04

p = 0.85

Episodic

Chronic

Frequency

98 (74%)

35 (26%)

Statistic

Gender (male / female)

74 (76%) / 24 (24%)

26 (74%) / 9 (26%)

χ² = 0.02

p = 0.89

Age [y], mean ± SD

41.7 ± 10.8

43.7 ± 9.5

p = 0.31