The Neck Disability Index is the most frequently evaluated question naire and shows positive results for internal consistency , content validity , structural validity , hypothesis testing , and responsiveness , but a negative result for reliability .
The other question naires show positive results , but the evidence for each measurement property is mostly limited , and at least 50 % of the information on measurement properties per question naire is lacking .
Purpose To critically appraise and compare the measurement properties of the original versions of  neck-specific question naires .
Responsiveness of the Neck Disability Index in patients with mechanical neck disorders.
PURPOSE Report the test-retest reliability , construct validity , minimum clinical ly important difference ( MCID ) , and minimal detectable change ( MDC ) for the Neck Disability Index ( NDI ) . STUDY DESIGN / SETTING Cohort study of patients presenting to outpatient physical therapy clinics . PATIENT SAMPLE Ninety-one subjects with a primary complaint of neck pain , with or without concomitant upper extremity ( UE ) symptoms , who were participants in a r and omized clinical trial . OUTCOME MEASURES NDI and the 15-point Global Rating of Change ( GRC ) self-report measures . METHODS All subjects completed the NDI at baseline and at a 3-week follow-up . Additionally , subjects completed the GRC scale  , which was used to dichotomize patients into improved or stable groups . Changes in the NDI were used to assess test-retest reliability , construct validity , MCID , and MDC . RESULTS Test-retest reliability was moderate for the NDI ( intraclass correlation coefficient , 0.64 ; 95 % confidence interval , 0.19 - 0.84 ) . For the NDI , the MCID was 7.5 points and the MDC was 10.2 points . CONCLUSIONS The NDI appears to demonstrate adequate responsiveness based on statistical reference criteria when used in a sample that approximates the high percentage of patients with neck pain and concomitant UE referred symptoms . Because the MCID is within the bounds of measurement error , a 10-point change ( the MDC ) should be used as the MCID
The Neck Disability Index is the most frequently evaluated question naire and shows positive results for internal consistency , content validity , structural validity , hypothesis testing , and responsiveness , but a negative result for reliability .
The other question naires show positive results , but the evidence for each measurement property is mostly limited , and at least 50 % of the information on measurement properties per question naire is lacking .
Purpose To critically appraise and compare the measurement properties of the original versions of  neck-specific question naires .