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Development and Initial Psychometric Properties of the Migraine Functional Disability Scale

Abstract

This study aimed to develop an instrument capable of measuring the level of functional impairment caused by migraine. In the initial phase, based on literature analysis and interviews with eight individuals diagnosed with migraine, 54 items were constructed describing impairments in individuals’ functioning during a migraine episode. Semantic and content analyses led to the exclusion of 14 items. In the second phase, 354 migraineurs participated. The internal structure was investigated using exploratory factor analyses, reliability was assessed using McDonald’s omega, and initial standardization was established by percentiles. The instrument, named the Migraine Functional Impairment Scale, consisted of 20 items divided into three factors: Activity Limitation (9 items, ω = .90), Emotional Impact (6 items, ω = .87), and Cognitive Impact (5 items, ω = .90). Although preliminary, the results suggest promising potential for the instrument in screening for signs of migraine-related impairment.

Keywords:
Migraine Headache; Test Validity; Headache; Test Construction; Psychometrics

Universidade de São Francisco, Programa de Pós-Graduação Stricto Sensu em Psicologia R. Waldemar César da Silveira, 105, Vl. Cura D'Ars (SWIFT), Campinas - São Paulo, CEP 13045-510, Telefone: (19)3779-3771 - Campinas - SP - Brazil
E-mail: revistapsico@usf.edu.br