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Health Expect. 2015 Feb;18(1):137-50. doi: 10.1111/hex.12022. Epub 2012 Nov 26.

Comparing the nine-item Shared Decision-Making Questionnaire to the OPTION Scale - an attempt to establish convergent validity.

Author information

1
Department of Medical Psychology, University Medical Center Hamburg-Eppendorf, Hamburg.

Abstract

BACKGROUND:

While there has been a clear move towards shared decision-making (SDM) in the last few years, the measurement of SDM-related constructs remains challenging. There has been a call for further psychometric testing of known scales, especially regarding validity aspects.

OBJECTIVE:

To test convergent validity of the nine-item Shared Decision-Making Questionnaire (SDM-Q-9) by comparing it to the OPTION Scale.

DESIGN:

Cross-sectional study.

SETTING AND PARTICIPANTS:

Data were collected in outpatient care practices. Patients suffering from chronic diseases and facing a medical decision were included in the study.

METHODS:

Consultations were evaluated using the OPTION Scale. Patients completed the SDM-Q-9 after the consultation. First, the internal consistency of both scales and the inter-rater reliability of the OPTION Scale were calculated. To analyse the convergent validity of the SDM-Q-9, correlation between the patient (SDM-Q-9) and expert ratings (OPTION Scale) was calculated.

RESULTS:

A total of 21 physicians provided analysable data of consultations with 63 patients. Analyses revealed good internal consistency of the SDM-Q-9 and limited internal consistency of the OPTION Scale. Inter-rater reliability of the latter was less than optimal. Association between the total scores of both instruments was weak with a Spearman correlation of r = 0.19 and did not reach statistical significance.

DISCUSSION:

By the use of the OPTION Scale convergent validity of the SDM-Q-9 could not be established. Several possible explanations for this result are discussed.

CONCLUSION:

This study shows that the measurement of SDM remains challenging.

KEYWORDS:

convergent validity; measurement; psychometrics; shared decision-making

PMID:
23176071
PMCID:
PMC5060753
DOI:
10.1111/hex.12022
[Indexed for MEDLINE]
Free PMC Article

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