A disease-specific questionnaire for measuring patient-reported outcomes and experiences in the Swedish National Diabetes Register : Development and evaluation of content validity, face validity, and test-retest reliability
Objective: To describe the development and evaluation of the content and face validity and test-retest reliability of a disease-specific questionnaire that measures patient-reported outcomes and experiences for the Swedish National Diabetes Register for adult patients who have type 1 or type 2 diabetes. Methods: In this methodological study, a questionnaire was developed over four phases using an
