Development of a Japanese version of the Advance Care Planning Engagement Survey: Examination of its reliability and validity.

The Japanese version of the ACP Engagement Survey was confirmed to have very good reliability regarding both internal consistency and test-retest reliability. Together with the result of the item analysis, we can conclude that the Japanese version of the ACP Engagement Survey is sufficiently reliable to be utilized in interventional studies, and it has acceptable content validity, construct validity, and criterion-related validity.