Implementation tells us more beyond pooled estimates: Secondary analysis of a multicountry mhealth trial to reduce blood pressure

Abstract

©Rodrigo M Carrillo-Larco, Safia S Jiwani, Francisco Diez-Canseco, Rebecca Kanter, Andrea Beratarrechea, Vilma Irazola, Manuel Ramirez-Zea, Adolfo Rubinstein, Homero Martinez, J Jaime Miranda, GISMAL Group. Background: The uptake of an intervention aimed at improving health-related lifestyles may be influenced by the participant’s stage of readiness to change behaviors. Objective: We conducted secondary analysis of the Grupo de Investigación en Salud Móvil en América Latina (GISMAL) trial according to levels of uptake of intervention (dose-response) to explore outcomes by country, in order to verify the consistency of the trial’s pooled results, and by each participant’s stage of readiness to change a given lifestyle at baseline. The rationale for this secondary analysis is motivated by the original design of the GISMAL study that was independently powered for the primary outcome-blood pressure-for each country. Methods: We conducted a secondary analysis of a mobile health (mHealth) mu