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 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-Q-Doc 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.
| Original language | English |
|---|---|
| Pages (from-to) | 105-114 |
| Number of pages | 10 |
| Journal | Health Promotion Perspectives |
| Volume | 9 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 1 Jan 2019 |
Keywords
- Cancer
- Confirmatory factor analysis
- Instrumental study
- Rasch
ASJC Scopus subject areas
- Health(social science)
- Education
- Public Health, Environmental and Occupational Health
