title: Reliability and validity of the migraine disability assessment scale among migraine and tension type headache in Iranian patients.
abstract: BACKGROUND
  MIDAS is a valid and reliable short questionnaire for assessment of headache related disability. Linguistic validation of Persian MIDAS and assessment of psychometric properties between tension type headache (TTH) and migraine were the aims of this study.
  
  
  METHODS
  Patients with migraine or TTH were included. At the first visit, we administered a headache symptom questionnaire, MIDAS, and SF-36. Patients filled out MIDAS in second and third visit within three and eight weeks after base line visit. Internal consistency (Cronbach α ) and test-retest reproducibility (Spearman correlation coefficient) were used to assess reliability. Convergent validity and MIDAS capability to differentiate between chronic and episodic headaches (migraine and TTH) were also assessed.
  
  
  RESULTS
  The 267 participants had episodic migraine (EM-64%), chronic migraine (CM-13.5%), episodic TTH (ETTH-13.5%), and chronic TTH (CTTH-9). Internal consistency reliability was 0.8 for the entire sample, 0.72 for TTH, and 0.82 for migraine. Test-retest reliability for all questions between visit 1 and visit 2 varied from 0.54 to 0.71. Convergent validity was assessed using SF-36 as an external referent. Patients with episodic headaches (EM and ETTH) had significantly lower MIDAS scores than chronic headaches (CM and CTTH).
  
  
  CONCLUSIONS
  Persian MIDAS is a valid and reliable questionnaire for migraine and TTH that can differentiate between episodic headache and chronic headache.
authors: Physiology Research Center, Department of Physiology, Isfahan University of Medical Sciences, Isfahan, Iran ; Medical Student Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
authors: Alireza
authors: 0000-0001-9480-949X
authors: A
authors: Zandifar
authors: Medical Student Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
authors: Fatemeh
authors: F
authors: Asgari
authors: Medical Student Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
authors: Faraidoon
authors: F
authors: Haghdoost
authors: Medical Student Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
authors: Samaneh Sadat
authors: SS
authors: Masjedi
authors: Medical Student Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
authors: Navid
authors: N
authors: Manouchehri
authors: Medical Student Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
authors: Mahboobeh
authors: M
authors: Banihashemi
authors: Department of Neurology and Isfahan Neurosciences Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
authors: Abbas
authors: A
authors: Ghorbani
authors: Department of Neurology and Isfahan Neurosciences Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
authors: Mohammad Reza
authors: MR
authors: Najafi
authors: Physiology Research Center, Department of Physiology, Isfahan University of Medical Sciences, Isfahan, Iran ; Department of Neurology and Isfahan Neurosciences Research Center, Isfahan University of Medical Sciences, Isfahan, Iran.
authors: Mohammad
authors: M
authors: Saadatnia
authors: Albert Einstein College of Medicine, Bronx, NY, USA ; Montefiore Medical Center, Bronx, NY, USA.
authors: Richard B
authors: RB
authors: Lipton
mesh_terms: D000328:Adult; D005260:Female; D006801:Humans; D007492:Iran / Q000453:epidemiology; D008297:Male; D008881:Migraine Disorders / Q000145:classification / Q000453:epidemiology* / Q000503:physiopathology*; D011594:Psychometrics / Q000379:methods* / Q000592:standards; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires; D018781:Tension-Type Headache / Q000145:classification / Q000453:epidemiology* / Q000503:physiopathology*; D055815:Young Adult