• Eur Spine J · Nov 2018

    Validation of the Croatian version of the Oswestry Disability Index.

    • Ivan Domazet, Jakob Nemir, Petra Barl, Krešimir Saša Đurić, Ivan Pašalić, Hrvoje Barić, and Marin Stančić.
    • Department of Neurosurgery, University Hospital Center Zagreb, Zagreb University School of Medicine, Kišpatićeva 12, 10000, Zagreb, Croatia. ivandomazet@yahoo.com.
    • Eur Spine J. 2018 Nov 1; 27 (11): 2814-2822.

    PurposeTo translate, cross-culturally adapt, and validate the Croatian version of the Oswestry Disability Index (ODI).MethodsThe original English-language ODI was cross-culturally adapted into Croatian and then evaluated in a group of 114 patients with chronic low back pain (LBP) at the Department of Neurosurgery, Zagreb University School of Medicine. Confirmatory factor analysis (CFA) was conducted with three models: two were theory driven (unidimensional and two dimensional-static and dynamic factors); the other was based on our exploratory factor analysis (EFA). Internal consistency and test-retest reliability were evaluated using Cronbach's α and the intraclass correlation coefficient (ICC), respectively. Construct validity was assessed by evaluating the correlation between the ODI and Visual Analogue Scale (VAS), and between the ODI and 36-item short form survey (SF-36) scores.ResultsThe EFA-derived two-dimensional structure explained 82.7% of the total variance and was significantly better than the other models (P < 0.001); however, none of the models had acceptable fit. Internal consistency (Cronbach α = 0.84) and test-retest reliability (ICC = 0.94) were satisfactory. The ODI was positively correlated with VAS (rs = 0.54, P < 0.001) and negatively correlated with all of the SF-36 sections (rs = - 0.35 to - 0.64, P < 0.001, all), apart from the role-physical (rs = - 0.02, P = 0.767).ConclusionsThe Croatian version of the ODI has acceptable psychometric properties. It appears to be suitable for assessment of LBP and treatment outcomes in Croatian-speaking patients. Overall, there was no evidence to reject the original unidimensional structure in favor of a two-factor solution. As such, the unidimensional structure should continue to be used in future studies. These slides can be retrieved under Electronic Supplementary Material.

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