Health Promot Perspect. 2019;9(2): 105-114.
doi: 10.15171/hpp.2019.15
PMID: 31249797
PMCID: PMC6588807
Scopus ID: 85066879481
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Original Article

Validating patient and physician versions of the shared decision making questionnaire in oncology setting

Babak Nejati 1, Chien-Chin Lin 2,3, Vida Imani 4, Maria Browall 5, Chung-Ying Lin 6, Anders Broström 5*, Amir H Pakpour 7,5* ORCID logo

1 Hematology and Oncology Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
2 Department of Laboratory Medicine and Division of Hematology, Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan
3 Graduate Institute of Clinical Medicine, National Taiwan University, Taipei, Taiwan
4 Pediatric Health Research Center, Tabriz University of Medical Sciences Tabriz, Iran
5 Department of Nursing, School of Health and Welfare, Jönköping University, Jönköping, Sweden
6 Department of Rehabilitation Sciences, The Hong Kong Polytechnic University, Hung Hom, Hong Kong
7 Social Determinants of Health Research Center, Qazvin University of Medical Sciences, Qazvin, Iran


Background: This study investigated the psychometric properties of the 9-Item Shared DecisionMaking Questionnaire (SDM-Q-9) and the 9-Item Shared Decision-Making Questionnaire–Physician 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
Citation: Nejati B, Lin CC, Imani V, Browall M, Lin CY, Broström A, et al. Validating patient and physician versions of the shared decisionmaking questionnaire in oncology setting. Health Promot Perspect. 2019;9(2):105-114. doi: 10.15171/hpp.2019.15.
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Submitted: 15 Dec 2018
Accepted: 12 Jan 2019
ePublished: 25 May 2019
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