Development of a new version of the Bristol Stool Form Scale: translation, content validity, face validity, and reliability of the Persian version.

Objectives: The Bristol Stool Form Scale (BSFS) is the most widely used scale for stool form assessment. This study aimed to translate the BSFS into the Persian version and determine its content validity, face validity, and reliability.

Design: Following permission, a forward-backward translation procedure was applied to translate the scale from English into Persian.