[Examining the psychometric properties of a new quality of life questionnaire in migraineurs].

Background: The deleterious effect of primary headaches on the sufferers' quality of life (QOL) has been abundantly documented using both generic and headache-specific instruments. The currently used questionnaires focus on a limited number of factors and therefore may not be sensitive enough to detect the effect of headache type and headache characteristics on QOL, despite the obvious clinical differences. We have devised a comprehensive questionnaire that may be more sensitive to the burden of headache.

Objective: To assess the psychometric properties of the new questionnaire on a group of migraineurs.

Patients And Method: We studied 117 migraineurs who completed the validated Hungarian version of the SF-36 generic QOL measure and our new, 25-item questionnaire. Reliability was assessed by internal consistency, measured by Cronbach's alpha of all items. Content validity was examined by calculating the correlation of the items with subscales of the SF-36 measure. The correlation of the patients' migraine characteristics with the questionnaire's items was used to assess criterion validity.

Results: The questionnaire was quick and easy to administer. The questionnaire demonstrated good reliability, with Cronbach's alpha being 0.893. Content validity was adequate; most "physical" items of the new questionnaire showed significant correlations with the bodily pain and role physical SF-36 subscales and most "psychical" and "social" items were correlated with mental health and social functioning SF-36 subscales. Criterion validity was adequate, with headache severity being correlated with most of the items.

Discussion: In this study the new headache-specific quality of life instrument showed adequate psychometric properties.