• Martijn M Stuiver, Marieke R ten Tusscher, Anita van Opzeeland, Wim Brendeke, Robert Lindeboom, Pieter U Dijkstra, and Neil K Aaronson.
• Department of Physiotherapy, The Netherlands Cancer Institute, Amsterdam, The Netherlands.
• Head Neck. 2016 Jan 1; 38 (1): 102-10.

BackgroundPatient-reported outcome measures evaluating shoulder disability after neck dissection have not been sufficiently validated. We assessed the psychometric properties of the Shoulder Disability Questionnaire (SDQ), Neck Dissection Impairment Index (NDII), and the Shoulder Pain and Disability Index (SPADI) in patients after neck dissection.MethodsOne hundred seven patients completed the SDQ, NDII, and SPADI on 4 occasions over 6 months, and underwent physical examination. We assessed internal consistency, test-retest reliability, clinical and construct validity, and responsiveness to change. The possibility of combining the NDII and SPADI items into a single scale was explored by Rasch analysis.ResultsAll questionnaires exhibited good reliability and validity. We were successful in fitting a Rasch model to the data.ConclusionThe results support the suitability of the SDQ, NDII, and the SPADI for use in neck dissection patients. Combining the SPADI and NDII in a single Rasch scale improves item difficulty distribution but reduces variability and discriminative ability.© 2015 Wiley Periodicals, Inc.

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