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Title: Psychometric characteristics of the Spanish version of instruments to measure neck pain disability
Author: Kovacs, Francisco M.
Bagó, Joan
Royuela, Ana
Seco, Jesús
Giménez, Sergio
Muriel, Alfonso
Abraira, Victor
Martín, José Luis
Peña, José Luis
Gestoso, Mario
Mufraggi, Nicole
Núñez Juárez, Montserrat
Corcoll, Josep
Gómez-Ochoa, Ignacio
Ramírez, Ma José
Calvo, Eva
Castillo, Ma Dolores
Martí, David
Fuster, Salvador
Fernández, Carmen
Gimeno, Nuria
Carballo, Alejandro
Milán, Álvaro
Vázquez, Dolores
Cañellas, Montserrat
Blanco, Ricardo
Brieva, Pilar
Rueda, Ma Trinidad
Álvarez, Luis
Gil del Real, María Teresa
Ayerbe, Joaquín
González, Luis
Ginel, Leovigildo
Ortega, Mariano
Bernal, Miryam
Bolado, Gonzalo
Vidal, Anna
Ausín, Ana
Ramón, Domingo
Mir, María Antonia
Tomás, Miguel
Zamora, Javier
Cano, Alejandra
Keywords: Coll
Neck pain disability
Spanish version of NDI
Issue Date: 2008
Publisher: BioMed Central
Abstract: Background: The NDI, COM and NPQ are evaluation instruments for disability due to NP. There was no Spanish version of NDI or COM for which psychometric characteristics were known. The objectives of this study were to translate and culturally adapt the Spanish version of the Neck Disability Index Questionnaire (NDI), and the Core Outcome Measure (COM), to validate its use in Spanish speaking patients with non-specific neck pain (NP), and to compare their psychometric characteristics with those of the Spanish version of the Northwick Pain Questionnaire (NPQ). Methods: Translation/re-translation of the English versions of the NDI and the COM was done blindly and independently by a multidisciplinary team. The study was done in 9 primary care Centers and 12 specialty services from 9 regions in Spain, with 221 acute, subacute and chronic patients who visited their physician for NP: 54 in the pilot phase and 167 in the validation phase. Neck pain (VAS), referred pain (VAS), disability (NDI, COM and NPQ), catastrophizing (CSQ) and quality of life (SF-12) were measured on their first visit and 14 days later. Patients' self-assessment was used as the external criterion for pain and disability. In the pilot phase, patients' understanding of each item in the NDI and COM was assessed, and on day 1 test-retest reliability was estimated by giving a second NDI and COM in which the name of the questionnaires and the order of the items had been changed. Results: Comprehensibility of NDI and COM were good. Minutes needed to fill out the questionnaires [median, (P25, P75)]: NDI. 4 (2.2, 10.0), COM: 2.1 (1.0, 4.9). Reliability: [ICC, (95%CI)]: NDI: 0.88 (0.80, 0.93). COM: 0.85 (0.75,0.91). Sensitivity to change: Effect size for patients having worsened, not changed and improved between days 1 and 15, according to the external criterion for disability: NDI: -0.24, 0.15, 0.66; NPQ: -0.14, 0.06, 0.67; COM: 0.05, 0.19, 0.92. Validity: Results of NDI, NPQ and COM were consistent with the external criterion for disability, whereas only those from NDI were consistent with the one for pain. Correlations with VAS, CSQ and SF-12 were similar for NDI and NPQ (absolute values between 0.36 and 0.50 on day 1, between 0.38 and 0.70 on day 15), and slightly lower for COM (between 0.36 and 0.48 on day 1, and between 0.33 and 0.61 on day 15). Correlation between NDI and NPQ: r = 0.84 on day 1, r = 0.91 on day 15. Correlation between COM and NPQ: r = 0.63 on day 1, r = 0.71 on day 15. Conclusion: Although most psychometric characteristics of NDI, NPQ and COM are similar, those from the latter one are worse and its use may lead to patients' evolution seeming more positive than it actually is. NDI seems to be the best instrument for measuring NP-related disability, since its results are the most consistent with patient's assessment of their own clinical status and evolution. It takes two more minutes to answer the NDI than to answer the COM, but it can be reliably filled out by the patient without assistance.
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It is part of: BMC Musculoskeletal Disorders, 2008, vol. 9, núm. 42
Related resource:
ISSN: 1471-2474
Appears in Collections:Articles publicats en revistes (Cirurgia i Especialitats Medicoquirúrgiques)

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