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Development of the Italian Version of the Neck Disability Index: cross-cultural adaptation, factor analysis, reliability, validity, and sensitivity to change.
Spine (Phila Pa 1976). 2012 Aug 01; 37(17):E1038-44.S

Abstract

STUDY DESIGN

Evaluation of the psychometric properties of a translated and culturally adapted questionnaire.

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).

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.

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 α) 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.

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 (α = 0.842) and test-retest reliability (intraclass coefficient correlation = 0.846). Construct validity showed a good correlation with Neck Pain and Disability Scale (ρ = 0.687), moderate correlations with the numerical rating scale (ρ = 0.545), and Hospital Anxiety and Depression Scale (ρ = 0.422 for the Anxiety score and ρ = 0.546 for the Depression score), and poor correlations with the 36-Item Short Form Health Survey subscales (ρ = 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.

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.

Authors+Show Affiliations

Physical Medicine and Rehabilitation Unit, Scientific Institute of Lissone, Institute of Care and Research, Salvatore Maugeri Foundation, IRCCS, Via Monsignor Bernasconi 16, Lissone (Milan), Italy. marco.monticone@fsm.itNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, N.I.H., Extramural

Language

eng

PubMed ID

22487712

Citation

Monticone, Marco, et al. "Development of the Italian Version of the Neck Disability Index: Cross-cultural Adaptation, Factor Analysis, Reliability, Validity, and Sensitivity to Change." Spine, vol. 37, no. 17, 2012, pp. E1038-44.
Monticone M, Ferrante S, Vernon H, et al. Development of the Italian Version of the Neck Disability Index: cross-cultural adaptation, factor analysis, reliability, validity, and sensitivity to change. Spine (Phila Pa 1976). 2012;37(17):E1038-44.
Monticone, M., Ferrante, S., Vernon, H., Rocca, B., Dal Farra, F., & Foti, C. (2012). Development of the Italian Version of the Neck Disability Index: cross-cultural adaptation, factor analysis, reliability, validity, and sensitivity to change. Spine, 37(17), E1038-44. https://doi.org/10.1097/BRS.0b013e3182579795
Monticone M, et al. Development of the Italian Version of the Neck Disability Index: Cross-cultural Adaptation, Factor Analysis, Reliability, Validity, and Sensitivity to Change. Spine (Phila Pa 1976). 2012 Aug 1;37(17):E1038-44. PubMed PMID: 22487712.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Development of the Italian Version of the Neck Disability Index: cross-cultural adaptation, factor analysis, reliability, validity, and sensitivity to change. AU - Monticone,Marco, AU - Ferrante,Simona, AU - Vernon,Howard, AU - Rocca,Barbara, AU - Dal Farra,Fulvio, AU - Foti,Calogero, PY - 2012/4/11/entrez PY - 2012/4/11/pubmed PY - 2012/12/18/medline SP - E1038 EP - 44 JF - Spine JO - Spine (Phila Pa 1976) VL - 37 IS - 17 N2 - STUDY DESIGN: Evaluation of the psychometric properties of a translated and culturally adapted questionnaire. 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). 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. 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 α) 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. 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 (α = 0.842) and test-retest reliability (intraclass coefficient correlation = 0.846). Construct validity showed a good correlation with Neck Pain and Disability Scale (ρ = 0.687), moderate correlations with the numerical rating scale (ρ = 0.545), and Hospital Anxiety and Depression Scale (ρ = 0.422 for the Anxiety score and ρ = 0.546 for the Depression score), and poor correlations with the 36-Item Short Form Health Survey subscales (ρ = 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. 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. SN - 1528-1159 UR - https://www.unboundmedicine.com/medline/citation/22487712/Development_of_the_Italian_Version_of_the_Neck_Disability_Index:_cross_cultural_adaptation_factor_analysis_reliability_validity_and_sensitivity_to_change_ L2 - https://doi.org/10.1097/BRS.0b013e3182579795 DB - PRIME DP - Unbound Medicine ER -