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BMC Medical Informatics and Decision Making
Published in: BMC Medical Informatics and Decision Making 1/2013

Open Access 01-12-2013 | Research article

Development and validation of the Japanese version of the Decisional Conflict Scale to investigate the value of pharmacists’ information: a before and after study

Authors: Takashi Kawaguchi, Kanako Azuma, Takuhiro Yamaguchi, Hiroshi Soeda, Yusuke Sekine, Masayoshi Koinuma, Hironori Takeuchi, Takao Akashi, Sakae Unezaki

Published in: BMC Medical Informatics and Decision Making | Issue 1/2013

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Abstract

Background

The information provided in patient-centered care and shared decision-making influences patients’ concerns and adherence to treatment. In the decision-making process, patients experience decisional conflict. The Decisional Conflict Scale (DCS) is a 16-item, self-administered questionnaire consisting of 5 subscales developed to assess patients’ decisional conflict. This study aimed to develop the Japanese version of the DCS and to clarify the influence of the information provided by pharmacists’ on decisional conflict among patients with cancer.

Methods

We developed the Japanese version of the DCS by using the forward-backward translation method. One hundred patients who were recommended a new chemotherapy regimen were recruited. The psychometric properties of the Japanese DCS, including internal consistency, convergent validity, discriminant validity, and construct validity, were examined. We assessed the decisional conflict of patients before and after the pharmacists’ provision of information.

Results

Ninety-four patients, predominately female, with an average age of 58.1 years were sampled. The scores on the 5 subscales of the DCS showed high internal consistency (Cronbach’s alpha = 0.84–0.96). Multi-trait scaling analysis and cluster analysis showed strong validity. The mean total DCS score decreased significantly from 40.2 to 31.7 after patients received information from the pharmacists (p < 0.001, paired t-test). Scores on all 5 subscales, namely, uncertainty, informed, values clarity, support, and effective decision, also significantly improved (p < 0.001 for all categories, paired t-test).

Conclusions

The psychometric properties of the Japanese version of the DCS are considered appropriate for it to be administered to patients with cancer. Pharmacists’ provision of information was able to decrease decisional conflict among patients with cancer who were recommended a new chemotherapy regimen.
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Metadata
Title
Development and validation of the Japanese version of the Decisional Conflict Scale to investigate the value of pharmacists’ information: a before and after study
Authors
Takashi Kawaguchi
Kanako Azuma
Takuhiro Yamaguchi
Hiroshi Soeda
Yusuke Sekine
Masayoshi Koinuma
Hironori Takeuchi
Takao Akashi
Sakae Unezaki
Publication date
01-12-2013
Publisher
BioMed Central
Published in
BMC Medical Informatics and Decision Making / Issue 1/2013
Electronic ISSN: 1472-6947
DOI
https://doi.org/10.1186/1472-6947-13-50

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