Abstract
BackgroundMigraine Disability Assessment Scale (MIDAS) is a useful tool to measure headache-related disability. Modified MIDAS with 4-week recall period reduces recall bias and improves accuracy of the results. This study aimed at validating mMIDAS in Portuguese.MethodsStudied population consisted of adult migraine patients attending a headache outpatient clinic. Reliability was assessed by internal consistency and reproducibility in a 3-week test-retest. Content validity was evaluated by two expert panels. Construct validity was tested by comparing mMIDAS-P index in socioeconomic and clinical patient groups and scale unidimensionality was evidenced by factor analysis. Criterion validity was tested using EQ-5D-5L and HADS.ResultsNinety-two patients, 88% female, mean age of 44 years, participated. They had, in average, 9.7 headache days in previous month, pain averaging 7.5/10. About 69.9% were on a migraine prophylactic treatment, and 42.4% had severe disability; 29.4 and 13.0% showed, respectively, moderate/severe anxiety and depression. Content validity showed that mMIDAS-P is simple and clinically useful. It did not show to be determined by patient’s sociodemographic characteristics and it was correlated with depression scale and EQ-5D-5L. Test-retest demonstrated high reproductive reliability and good internal consistency.ConclusionmMIDAS-P is valid and reliable. We strongly recommend it for clinical and research use.
Highlights
Migraine Disability Assessment Scale (MIDAS) is a useful tool to measure headache-related disability
We looked at the correlation factor between each item of Modified Migraine Disability Assessment Scale (mMIDAS)-P and the whole scale
Comparing mMIDAS-P index with scores obtained in known-groups, we found no significant differences among the several levels of patients’ characteristics, namely gender, age and education, as well as clinical variables age of migraine diagnosis, time of follow-up, previous prophylactic treatment, and other comorbidities
Summary
Migraine Disability Assessment Scale (MIDAS) is a useful tool to measure headache-related disability. A useful tool to measure this disability is the Migraine Disability Assessment Scale (MIDAS), developed after 1998 by Stewart and colleagues [3,4,5,6], aimed to improve the communication between care providers and migraine patients. It was developed from the Headache Impact Questionnaire (GImQ) to measure headache severity, excluding the pain dimension, to obtain an easier way to compute a global score [7]. MIDAS proved to be useful to identify adequate treatments and to stratify them based on the level of patient disability [9, 23]
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