title: Validity and reliability of the Persian version of the dizziness handicap inventory.
abstract: BACKGROUND
  Dizziness as a common symptom affecting many aspects of the patient's life and it is hard to be fully evaluated. The dizziness handicap inventory (DHI) is a reliable self-perceived questionnaire in the evaluation of dizziness impacts. The purposes of this study are translation of the DHI to Persian language and measuring its psychometric properties, including face, content, discriminate and construct validity, internal consistency and reliability.
  
  
  METHODS
  The English version of the DHI is translated to Persian language based on international quality of life assessment protocol. 97 participants, including 57 patients with mean age of 44.5-year-old and 40 healthy people (mean age of 34.1) participated in this study during the period of November 2012 to June 2013 in audiology clinics of Tehran University of medical sciences.
  
  
  RESULTS
  The Persian version of DHI showed good face and content validity. The internal consistency of DHI-P was good, the Cronbach's alpha was 0.79, 0.82, 0.83, and 0.90 for total and emotional, physical and functional subscales; respectively, in reliability, There was a high correlation between test re-test scores (r = 0.90, P = 0.000). Intraclass correlation coefficient (ICC) was 0.96 for total score and 0.92, 0.92, and 0.96 for emotional, physical and functional subscales; respectively.
  
  
  CONCLUSIONS
  Considering good psychometric properties, we suggest that DHI-P can use for evaluating the dizziness effects on quality of life in Persian population.
authors.affiliation: Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Sadegh
authors.initials: S
authors.lastname: Jafarzadeh
authors.affiliation: Department of Neurosurgery, Iran University of Medical Sciences, Tehran, Iran.
authors.forename: Eshagh
authors.initials: E
authors.lastname: Bahrami
authors.affiliation: Department of Audiology, Rehabilitation Research Center, Faculty of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran.
authors.forename: Akram
authors.initials: A
authors.lastname: Pourbakht
authors.affiliation: Department of Biostatistics, School of Rehabilitation, Tehran University of Medical Sciences, Tehran, Iran.
authors.forename: Shohreh
authors.initials: S
authors.lastname: Jalaie
authors.affiliation: Department of ENT and Head and Neck Surgery, Iran University of Medical Sciences, Tehran, Iran.
authors.forename: Ahmad
authors.initials: A
authors.lastname: Daneshi
keywords: Dizziness handicap inventory; Persian version; reliability; translation; validity