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Equivalence between digital and paper-based Western Ontario Rotator Cuff index (WORC): a two-way crossover equivalence trial
ESSKA Academy. Hollman F. Nov 8, 2019; 284406; epESA-10 Topic: Shoulder
Freek Hollman
Freek Hollman
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Equivalence between digital and paper-based Western Ontario Rotator Cuff index (WORC): a two-way crossover equivalence trial

ePoster - epESA-10

Topic: Basic Science and Biomechanics

Wessel R., de Raadt W.M., Hollman F., Wolterbeek N.
St. Antonius Hospital, Orthopaedic Surgery, Utrecht, Netherlands

Introduction: Patient-reported outcome measures are ubiquitous in today´s health care and clinical trials. The desire to shift from paper-based to digital administration is becoming more evident. It is not recommended to change the mode of administration without careful consideration, as an outcome tool should only be used in the validated format. It is necessary to first demonstrate that measurement properties remain comparable to the original format.
Objective: Collecting digital data offers many advantages over paper-and-pencil administration for both the patient and the administrator. It was hypothesized that no difference would exist between the digital and paper-based collected results and that these versions could therefore be considered interchangeable.
Aims: To determine whether the digital version of the Western Ontario Rotator Cuff Index (WORC) produces results comparable with the paper-based version of the WORC.
Methods: This study concerned a prospective, single center, cross-sectional, equivalence trial with a two-way crossover design. All patients older than 18 years of age with shoulder problems such as osteoarthritis, Sub Acromial Pain Syndrome, rotator cuff or biceps tendon problems or frozen shoulder, were eligible for this study. All patients gave informed consent and completed both paper and digital versions of the WORC. The two assessments were separated by a minimum of 30 minutes. Paired samples t-test was performed to determine the paired differences between the modes of administration. Intraclass correlation coefficients, Bland Altman plots and the limits of agreement were created to analyse the agreement between the paper-based and digitalversion of the WORC.
Results: A total of 93 patients were included. No significant differences were found between the two modes of administration. The mean paired differences ranged between 0.1 and 2.0 points on a 0-100 scale. The intraclass correlation coefficients ranged between 0.82 and 0.92 which is considered to be good to excellent. The scatter plot and Bland Altman plot of the WORC total scores showed no systematic errors between the modes of administration.
Conclusion: The digital version of the WORC produces results comparable with the paper-based version and could therefore be considered interchangeable.
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