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Title: Validating patient and physician versions of the shared decision making questionnaire in oncology setting
Authors: Nejati, B
Lin, CC
Imani, V
Browall, M
Lin, CY 
Brostrom, A
Pakpour, AH
Issue Date: 2019
Source: Health promotion perspectives, 2019, v. 9, no. 2, p. 105-114
Abstract: Background: This study investigated the psychometric properties of the 9-Item Shared Decision-Making Questionnaire (SDM-Q-9) and the 9-Item Shared Decision-Making QuestionnairePhysician version (SDM-Q-Doc) using comprehensive and thorough psychometric methods in an oncology setting.
Methods: Cancer survivors (n = 1783; 928 [52.05%] males) and physicians (n= 154; 121 [78.58%] males) participated in this study. Each cancer survivor completed the SDM-Q-9. Physicians completed the SDM-Q-Doc for each of their cancer patient. Confirmatory factor analysis (CFA) and Rasch model were used to test the psychometric properties of SDM-Q-9 and SDM-Q-Doc.
Results: SDM-Q-9 and SDM-Q-Doc demonstrated unidimensional structure in CFA and Rasch model. In addition, the measurement invariance was supported for both SDM-Q-9 and SDM-QDoc across sex using the multigroup CFA. Rash analysis indicates no differential item functioning (DIF) across sex for all the SDM-Q-9 and SDM-Q-Doc items. SDM-Q-9 and SDM-Q-Doc were moderately correlated (r = 0.41; P < 0.001).
Conclusion: SDM-Q-9 and SDM-Q-Doc are valid instruments to assess shared decision making in the oncology setting.
Keywords: Confirmatory factor analysis
Cancer
Rasch
Instrumental study
Publisher: Tabriz University of Medical Sciences
Journal: Health promotion perspectives 
EISSN: 2228-6497
DOI: 10.15171/hpp.2019.15
Rights: CC-BY © 2019 The Author(s). This is an open access article distributed under the terms of the Creative Commons Attribution License(http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
The following publication Nejati B, Lin CC, Imani V, Browall M, Lin CY, Broström A, et al. Validating patient and physician versions of the shared decision making questionnaire in oncology setting. Health Promot Perspect. 2019;9(2):105-114 is available at https://dx.doi.org/10.15171/hpp.2019.15
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