Martijn M Stuiver1,2, Marieke R ten Tusscher1, Anita van Opzeeland3, Wim Brendeke4, Robert Lindeboom2, Pieter U Dijkstra5, Neil K Aaronson6. 1. Department of Physiotherapy, The Netherlands Cancer Institute, Amsterdam, The Netherlands. 2. Department of Clinical Epidemiology, Biostatistics and Bioinformatics, Academic Medical Centre, University of Amsterdam, Amsterdam, The Netherlands. 3. Department of Physiotherapy, Medical Centre Leeuwarden, Leeuwarden, The Netherlands. 4. Department of Physiotherapy, Rijnstate Hospital, Arnhem, The Netherlands. 5. University of Groningen, University Medical Centre Groningen, Department of Rehabilitation and Department of Oral and Maxillofacial Surgery, Groningen, the Netherlands. 6. Division of Psychosocial Research and Epidemiology, The Netherlands Cancer Institute, Amsterdam, The Netherlands.
Abstract
BACKGROUND: Patient-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. METHODS: One 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. RESULTS: All questionnaires exhibited good reliability and validity. We were successful in fitting a Rasch model to the data. CONCLUSION: The 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.
BACKGROUND:Patient-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. METHODS: One 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. RESULTS: All questionnaires exhibited good reliability and validity. We were successful in fitting a Rasch model to the data. CONCLUSION: The 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.
Authors: Elise M Gane; Steven M McPhail; Anna L Hatton; Benedict J Panizza; Shaun P O'Leary Journal: J Cancer Surviv Date: 2018-05-16 Impact factor: 4.442