References
- Cook C, Richardson JK, Braga L, et al. Cross-cultural adaptation and validation of the Brazilian Portuguese version of the Neck Disability Index and Neck Pain and Disability Scale. Spine. 2006;31:1621–1627.
- Guzy G, Vernon H, Polczyk R, et al. Psychometric validation of the authorized Polish version of the Neck Disability Index. Disabil Rehabil. 2013;35:2132–2137.
- Nakamaru K, Vernon H, Aizawa J, et al. Crosscultural adaptation, reliability, and validity of the Japanese version of the neck disability index. Spine. 2012;37:E1343–E1347.
- Shaheen AA, Omar MT, Vernon H. Cross-cultural adaptation, reliability, and validity of the Arabic version of neck disability index in patients with neck pain. Spine. 2013;38:E609–E615.
- Shashua A, Geva Y, Levran I. Translation, validation, and crosscultural adaptation of the Hebrew version of the neck disability index. Spine. 2016;41:1036–1040.
- Song KJ, Choi BW, Choi BR, et al. Cross-cultural adaptation and validation of the Korean version of the neck disability index. Spine. 2010;35:E1045–E1049.
- Swanenburg J, Humphreys K, Langenfeld A, et al. Validity and reliability of a German version of the Neck Disability Index (NDI-G). Man Ther. 2014;19:52–58.
- Andrade Ortega JA, Delgado Martinez AD, Almecija Ruiz R. [Validation of a Spanish version of the Neck Disability Index]. Med Clin (Barc). 2008;130:85–89.
- Croft AC, Milam B, Meylor J, et al. Confirmatory factor analysis and multiple linear regression of the neck disability index: assessment if subscales are equally relevant in whiplash and nonspecific neck pain. J Chiropractic Med. 2016;15:87–94.
- Cruz EB, Fernandes R, Carnide F, et al. Cross-cultural adaptation and validation of the neck disability index to European Portuguese language. Spine. 2015;40:E77–E82.
- Kesiktas N, Ozcan E, Vernon H. Clinimetric properties of the Turkish translation of a modified neck disability index. BMC Musculoskelet Disord. 2012;13:25.
- 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. 2012;37:E1038–E1044.
- Nieto R, Miro J, Huguet A. Disability in subacute whiplash patients: usefulness of the neck disability index. Spine. 2008;33:E630–E635.
- Salo P, Ylinen J, Kautiainen H, et al. Reliability and validity of the Finnish version of the neck disability index and the modified neck pain and disability scale. Spine. 2010;35:552–556.
- Trouli MN, Vernon HT, Kakavelakis KN, et al. Translation of the Neck Disability Index and validation of the Greek version in a sample of neck pain patients. BMC Musculoskelet Disord. 2008;9:106.
- Uthaikhup S, Paungmali A, Pirunsan U. Validation of Thai versions of the Neck Disability Index and Neck Pain and Disability Scale in patients with neck pain. Spine. 2011;36:E1415–E1421.
- Johansen JB, Andelic N, Bakke E, et al. Measurement properties of the Norwegian version of the neck disability index in chronic neck pain. Spine. 2013;38:851–856.
- van der Velde G, Beaton D, Hogg-Johnston S, et al. Rasch analysis provides new insights into the measurement properties of the neck disability index. Arthritis Rheum. 2009;61:544–551.
- Ailliet L, Knol DL, Rubinstein SM, et al. Definition of the construct to be measured is a prerequisite for the assessment of validity. The Neck Disability Index as an example. J Clin Epidemiol. 2013;66:775–782; quiz 82.e1–2.
- Hung M, Cheng C, Hon SD, et al. Challenging the norm: further psychometric investigation of the neck disability index. Spine J. 2015;15:2440–2445.
- Walton DM, MacDermid JC. A brief 5-item version of the Neck Disability Index shows good psychometric properties. Health Qual Life Outcomes. 2013;11:108.
- Streiner DL. Starting at the beginning: an introduction to coefficient alpha and internal consistency. J Pers Assess. 2003;80:99–103.
- Tavakol M, Dennick R. Making sense of Cronbach's alpha. Int J Med Educ. 2011;2:53–55.
- Kaiser HF. The application of electronic computers to factor analysis. Educ Psychol Meas. 1960;20:141–151.
- Baker FB. The basics of item response theory. USA: ERIC Clearinghouse on Assessment and Evaluation; 2001.
- Weaver B, Maxwell H. Exploratory factor analysis and reliability analysis with missing data: a simple method for SPSS Users. TQMP. 2014;20:143–152.