title: Subjective health measure used on Chinese patients with neck pain in Hong Kong.
abstract: METHODS
  A prospective observational study was conducted on the use of the Chinese version of the Northwick Park Neck Pain Questionnaire.
  
  
  OBJECTIVE
  To examine the reliability, validity, and responsiveness of the Chinese version of the Northwick Park Neck Pain Questionnaire in Chinese patients with neck pain in Hong Kong.
  
  
  BACKGROUND
  There is increasing recognition that patient perspectives are essential both in making medical decisions and in judging the treatment outcomes. A valid Chinese version of a neck disability index questionnaire is urgently needed for effective and reliable evaluation of the treatment outcomes for patients with neck pain.
  
  
  METHODS
  Two samples with 532 consecutive adult patients with neck pain from seven physiotherapy outpatient departments in Hong Kong who completed the Northwick Park Neck Pain Questionnaire were observed and measured at different intervals: at the beginning of physiotherapy, at 7 days, at 3 weeks, and 6 weeks after physiotherapy.
  
  
  RESULTS
  The questionnaire had good content validity, very good test-retest reliability, and internal consistency (intraclass correlation coefficient, 0.95; Cronbach's alpha, 0.87). It also had good validity (Spearman correlation coefficient of 0.59 when the score was correlated with that of a generic 42-item Chinese health questionnaire) and good responsiveness (effect size of 1.11 at week 6 after treatment began).
  
  
  CONCLUSIONS
  The Chinese version of the Northwick Park Neck Pain Questionnaire has been shown to demonstrate very good content validity, a high degree of test-retest reliability, and internal consistency. It also exhibited good construct validity and high sensitivity to changes in severity over time.
authors.affiliation: Department of Rehabilitation Sciences, the Hong Kong Polytechnic University. rstchiu@polyu.edu.hk
authors.forename: T T
authors.initials: TT
authors.lastname: Chiu
authors.forename: T H
authors.initials: TH
authors.lastname: Lam
authors.forename: A J
authors.initials: AJ
authors.lastname: Hedley
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003466:Cultural Characteristics; D005260:Female; D006305:Health Status Indicators; D006723:Hong Kong; D006801:Humans; D008297:Male; D008875:Middle Aged; D019547:Neck Pain / Q000503:physiopathology*; D010147:Pain Measurement / Q000379:methods*; D011446:Prospective Studies; D015203:Reproducibility of Results; D011795:Surveys and Questionnaires