Evaluating the reliability of multi-item scales: a non-parametric approach to the ordered categorical structure of data collected with the Swedish version of the Tampa Scale for Kinesiophobia and the Self-Efficacy Scale.

Bunketorp, Lina,1975Gothenburg University,Göteborgs universitet,Institutionen för arbetsterapi och fysioterapi,Institute of Occupational Therapy and Physiotherapy (author)

OBJECTIVE: To compare the ability of a rank-invariant non-parametric method with that of kappa statistics to evaluate the reliability of the Swedish version of the Tampa Scale for Kinesiophobia and the Self-Efficacy Scale by identifying systematic and random disagreement. The aim was, further, to compare 2 different statistical approaches to obtain a global value from multi-item scales. DESIGN: A test-retest study. SUBJECTS: A total of 46 patients with whiplash-associated disorders were enrolled and 39 (85%) completed the test-retest assessment. METHODS: Data from the multi-item scales were summarized using both sum and median scores. Paired data were evaluated with a rank-invariant statistical method to identify systematic and random disagreement. Data were also evaluated with kappa statistics. RESULTS: The non-parametric approach demonstrated that the Swedish version of the Tampa Scale for Kinesiophobia and the Self-Efficacy Scale are reliable for patients with whiplash-associated disorders. In contrast to the rank-invariant method, kappa statistics provided no information on disagreement between the 2 test occasions. Median scoring improved reliability due to lack of disagreement while the sum scores method was characterized by random individual disagreement. CONCLUSION: This study has increased understanding of the advantages and limitations of 2 non-parametric statistical methods and, it is hoped, will contribute to the development of reliable measurements.

Carlsson, Jane,1946Gothenburg University,Göteborgs universitet,Institutionen för arbetsterapi och fysioterapi,Institute of Occupational Therapy and Physiotherapy(Swepub:gu)xcarja (author)
Kowalski, Jan (author)
Stener-Victorin, Elisabet,1964Gothenburg University,Göteborgs universitet,Institutionen för arbetsterapi och fysioterapi,Institute of Occupational Therapy and Physiotherapy(Swepub:gu)xsteel (author)
Göteborgs universitetInstitutionen för arbetsterapi och fysioterapi (creator_code:org_t)

In:Journal of rehabilitation medicine : official journal of the UEMS European Board of Physical and Rehabilitation Medicine: Medical Journals Sweden AB37:5, s. 330-41650-1977

By the author/editor: Bunketorp, Lina, ...; Carlsson, Jane, ...; Kowalski, Jan; Stener-Victorin, ...

About the subject

MEDICAL AND HEALTH SCIENCES: MEDICAL AND HEAL ...; and Clinical Medicin ...; and Surgery

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