Development of a Mobile Phone Hypertension Specific Self-management System: Content Validity and Reliability

Abstract

Background Self-management support tools, facilitating patients' understanding of relationships between wellbeing, blood pressure and lifestyle may help to improve adherence to hypertension treatment. We report on the development of a multi-module mobile phone self-management system and on evaluations of the self-report module regarding content validity and reliability. Methods Domains and items were derived from focus group interviews with patients and providers. Items and response formats were designed to fit all mobile phones. Content validity was iteratively assessed in 21 cognitive interviews in four rounds. Reliability was examined by test-retest. Findings The focus groups resulted in six domains covered by 16 items. The cognitive interviews showed good item comprehension, relevance and coverage. Reliability was satisfactory. Discussion The self-report module appears relevant to the self-management of hypertension. The system, also including modules for reminders/encouragements, blood pressure measurements and feedback of self-reports in relation to blood pressure, will be evaluated in clinical practice as a tool to support patients in self-managing their hypertension.