Validity and reliability of the 9‑item Shared Decision Making Questionnaire (SDM‑Q‑9) in a national survey in Hungary

Rencz, Fanni and Tamási, Béla and Brodszky, Valentin and Gulácsi, László and Weszl, Miklós and Péntek, Márta (2019) Validity and reliability of the 9‑item Shared Decision Making Questionnaire (SDM‑Q‑9) in a national survey in Hungary. The European Journal of Health Economics, 2019 (20). S43-S55. DOI

PDF - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader

Official URL:

A nyílt hozzáférést az EISZ és a kiadó között létrejött "Read and Publish" szerződés biztosította. Open access was provided "Read and Publish" contract between EIS and the publisher.


Background The nine-item Shared Decision Making Questionnaire (SDM-Q-9) is one of the most frequently applied instruments for assessing patients’ involvement in medical decision-making. Our objectives were to develop a Hungarian version of SDM-Q-9, to evaluate its psychometric properties and to compare its performance between primary and specialised care settings. Methods In 2019, a sample of adults (n=537) representative of the Hungarian general population in terms of age, gender and geographic region completed an online survey with respect to a recent health-related decision. Outcome measures included SDM-Q-9 and Control Preferences Scale-post (CPSpost). Item characteristics, internal consistency reliability and the factor structure of SDM-Q-9 were determined. Results The overall ceiling and foor efects for SDM-Q-9 total scores were 12.3% and 2.2%, respectively. An excellent internal consistency reliability (Cronbach’s alpha 0.925) was demonstrated. Exploratory factor analysis resulted in a onefactor model explaining 63.5% of the variance of SDM-Q-9. A confrmatory factor analysis supported the acceptability of this model. Known-groups validity was confrmed with CPSpost categories; mean SDM-Q-9 total scores were higher in the ‘Shared decision’ category (72.6) compared to both ‘Physician decided’ (55.1, p=0.0002) and ‘Patient decided’ (57.2, p=0.0086) categories. In most aspects of validity and reliability, there was no statistically signifcant diference between primary and specialised care. Conclusions The overall good measurement properties of the Hungarian SDM-Q-9 make the questionnaire suitable for use in both primary and specialised care settings. SDM-Q-9 may be useful for health policies targeting the implementation of shared decision-making and aiming to improve efciency and quality of care in Hungary.

Item Type:Article
Uncontrolled Keywords:shared decision-making, SDM-Q-9, primary care, specialised care, psychometrics
JEL classification:I10 - Health: General
Subjects:General statistics
Social welfare, insurance, health care
ID Code:5317
Deposited By: Veronika Vitéz
Deposited On:04 Apr 2020 15:42
Last Modified:04 Apr 2020 16:27

Repository Staff Only: item control page