title: Psychometric properties of a modified version of the Roland-Morris disability questionnaire (M-RMDQ).
abstract: BACKGROUND
  Chronic pain can be associated with limitations in patient function. Assessment of pain-related limitations is one of the important outcome domains that should be considered when designing chronic pain clinical trials. Although a validated instrument for the assessment of pain-related disability in Iranian chronic low back pain (CLBP) patients exists, to date there is no psychometrically sound instrument to measure pain-related physical disability amongst Iranian chronic pain patients suffering from pain in other parts of their bodies.
  
  
  METHODS
  Six hundred chronic pain patients completed the Modified version of the Roland-Morris disability questionnaire (M-RMDQ) in addition to questionnaires on demographic variables, pain intensity and depression.
  
  
  RESULTS
  Internal consistency, test-retest reliability, and concurrent and predictive validity were calculated for the M-RMDQ. Internal consistency of the M-RMDQ items was acceptable (Cronbach's alpha=0.88). Test-retest reliability with a mean 36-day interval between assessments in 76 chronic pain patients was high (ICC=0.90). Concurrent validity was confirmed via significant correlations between the scores of M-RMDQ, depression and pain intensity. Predictive validity of the M-RMDQ was confirmed as it successfully differentiated pain clinic chronic pain patients from the non-pain clinic chronic pain population.
  
  
  CONCLUSIONS
  The M-RMDQ has adequate reliability and validity and can be used as a sound measure of physical disability associated with chronic pain among the Iranian population.
authors: Department of Psychology, Shahed University, Tehran, Iran. asghari7a@gmail.com
authors: Ali
authors: A
authors: Asghari
mesh_terms: D000328:Adult; D000367:Age Factors; D002908:Chronic Disease; D003863:Depression / Q000503:physiopathology; D004185:Disability Evaluation; D006233:Persons with Disabilities / Q000523:psychology*; D004522:Educational Status; D005260:Female; D006801:Humans; D017116:Low Back Pain / Q000503:physiopathology / Q000523:psychology; D008297:Male; D010147:Pain Measurement / Q000379:methods*; D058748:Pain Perception; D011594:Psychometrics; D015203:Reproducibility of Results; D012737:Sex Factors; D011795:Surveys and Questionnaires