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

Rencz, Fanni, Tamási, Béla, Brodszky, Valentin, Gulácsi, László, 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


Downloads per month over past year

View more statistics