Validity and reliability of the Portuguese version of the modified Migraine Disability Assessment

BMC Neurol. 2021 Feb 6;21(1):58. doi: 10.1186/s12883-021-02085-z.

Abstract

Background: Migraine 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.

Methods: Studied 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.

Results: Ninety-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.

Conclusion: mMIDAS-P is valid and reliable. We strongly recommend it for clinical and research use.

Keywords: Disability; Migraine; Patient reported outcomes; Productivity; Quality of life; mMIDAS-P.

Publication types

  • Validation Study

MeSH terms

  • Adult
  • Disability Evaluation*
  • Factor Analysis, Statistical
  • Female
  • Humans
  • Language*
  • Male
  • Middle Aged
  • Migraine Disorders* / epidemiology
  • Portugal
  • Reproducibility of Results
  • Surveys and Questionnaires*
  • Translating*