• André Pontes-Silva, Mariana Arias Avila, Cid André Fidelis-de-Paula-Gomes, and Almir Vieira Dibai-Filho.
• Postgraduate Program in Adult Health, Universidade Federal do Maranhão, Avenida dos Portugueses, 1966, Vila Bacanga, São Luís, MA, 65080-805, Brazil. contato.andrepsilva@gmail.com.
• Eur Spine J. 2021 Dec 1; 30 (12): 3593-3599.

ObjectivesTo assess test-retest reliability, internal consistency, construct validity, and the presence of ceiling and floor effects in the Brazilian version of the Short-Form Neck Disability Index (SF-NDI) in patients with chronic neck pain.MethodsOne hundred and fifty-six patients answered the Numerical Pain Rating Scale (NPRS), Short-Form Neck Disability Index (SF-NDI), Tampa Scale of Kinesiophobia (TKS), Pain Catastrophizing Scale (PCS), and the 36-Item Short-Form Health Survey questionnaire (SF-36). Another sample (n = 51) filled the SF-NDI at two different times, and test-retest reliability was measured using the intraclass correlation coefficient (ICC), standard error of measurement (SEM), and minimum detectable change (MDC). The internal consistency of the SF-NDI was analyzed by Cronbach's alpha. To determine construct validity, Spearman's correlation coefficient was used to determine the magnitude of the correlation between the score of the SF-NDI and other measurement instruments: NPRS, TKS, PCS, SF-36, and original NDI.ResultsSF-NDI presented substantial reliability (ICC = 0.844) and adequate internal consistency (Cronbach's alpha = 0.778). We observed significant values and with a correlation magnitude greater than 0.80 for the SF-NDI with the original NDI, between 0.30 and 0.50 for the correlations with TKS, and the functional capacity and pain domains of the SF-36, and less than 0.30 with the other study instruments. No participant reached the maximum score. Ceiling and floor effects were not observed.ConclusionsSF-NDI with 5 items has adequate measurement properties in Brazilian chronic neck pain patients.© 2021. The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.

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