Disability in cluster headache is more than attack frequency - results from and validation of the English version of the Cluster Headache Impact Questionnaire (CHIQ)

Table 3 Convergent validity. Spearman correlations in the active CH group (n = 155) are given. Abbreviations: CHIQ, Cluster Headache Impact Questionnaire; HADS, Hospital Anxiety and Depression Scale; HIT-6™, Headache Impact Test™; PSS, Perceived Stress Scale; SD, standard deviation

	Mean ± SD	Correlation with CHIQ
Attack frequency (in last week)	12.7 ± 11.2	0.29, p < 0.001
Acute medication frequency (in last week)	6.9 ± 7.3	0.21, p = 0.008
HIT-6 ™	63.3 ± 7.1	0.72, p < 0.001
HADS anxiety	8.6 ± 4.6	0.61, p < 0.001
HADS depression	7.7 ± 5.2	0.53, p < 0.001
PSS-10 total score	18.2 ± 8.4	0.61, p < 0.001
PSS-10 helplessness	11.8 ± 5.5	0.60, p < 0.001
PSS-10 self-efficacy	6.4 ± 3.3	0.57, p < 0.001

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