Development of the Italian Version of the Neck Disability Index Cross-cultural Adaptation, Factor Analysis, Reliability, Validity, and Sensitivity to Change

作者：Monticone Marco^*; Ferrante Simona; Vernon Howard; Rocca Barbara; Dal Farra Fulvio; Foti Calogero

来源：Spine, 2012, 37(17): E1038-E1044.

DOI：10.1097/BRS.0b013e3182579795

• neck disability index
• neck pain
• Italian validation
• outcome measures
• psychometric properties

Study Design. Evaluation of the psychometric properties of a translated and culturally adapted questionnaire. %26lt;br%26gt;Objective. Translating, culturally adapting, and validating the Italian version of the Neck Disability Index (NDI-I) to allow its use with Italian-speaking patients with neck pain (NP). %26lt;br%26gt;Summary of Background Data. More attention is being given to standardized outcome measures to improve interventions for NP. A translated form of the NDI has never been validated in Italian patients with NP. %26lt;br%26gt;Methods. The NDI-I was developed by forward-backward translation, a final review by an expert committee, and a test of the prefinal version to establish its correspondence with the original English version. The psychometric testing included factor analysis, reliability by internal consistency (Cronbach alpha) and test-retest reliability (intraclass coefficient correlation), construct validity by comparing NDI-I with the Neck Pain and Disability Scale, a numerical rating scale, the Hospital Anxiety and Depression Scale, and the 36-Item Short Form Health Survey (Spearman correlation), and sensitivity to change by calculating the smallest detectable change. %26lt;br%26gt;Results. The questionnaire was administered to 101 subjects with chronic NP and proved to be acceptable. Factor analysis revealed a 2-factor 10-item solution (explained variance: 56%). The questionnaire showed good internal consistency (alpha = 0.842) and test-retest reliability (intraclass coefficient correlation = 0.846). Construct validity showed a good correlation with Neck Pain and Disability Scale (rho = 0.687), moderate correlations with the numerical rating scale (rho = 0.545), and Hospital Anxiety and Depression Scale (rho = 0.422 for the Anxiety score and rho = 0.546 for the Depression score), and poor correlations with the 36-Item Short Form Health Survey subscales (rho = 0.066 to -0.286). The psychometric analyses of the subscales and total scale were similar. The smallest detectable change of the NDI-I was 3. %26lt;br%26gt;Conclusion. The NDI was successfully translated into Italian and proved to have a good factorial structure and psychometric properties that replicated the results of other versions. Its use is recommended for research purposes.

• 出版日期2012-8-1