Poster Topical Area: Nutritional Epidemiology
Location: Hall D
Poster Board Number: 813
Objectives: This study assessed user challenges and opportunities in implementing a tablet-based method for collecting dietary data in Burkina Faso and Viet Nam. INDDEX24 is comprised of a mobile app to conduct interviewer-administered multiple-pass 24-hour dietary recalls (24HR) synchronized to a web app to manage context-specific input databases: food list, food composition table, tag list and portion conversion factors. The International Dietary Data Expansion (INDDEX) Project is developing the platform to increase the availability, access, and use of dietary and food consumption data globally.
Methods: 24HRs using the INDDEX24 v.1 mobile app were conducted with adult men and women in rural and urban Burkina Faso (n=60) and Viet Nam (n=60), using context-specific input files prepared by local partners prior to the survey. Feedback from respondents and enumerators was collected after each interview using structured enumerator questionnaires, respondent cognitive debriefs, and enumerator focus groups. The platform was demonstrated for national and global technical experts and feedback sought through focus group discussions.
Results: Participant feedback was supportive of the mobile app for data collection, and highlighted the intuitive app structure. Recommended refinements included: improving operating speed to shorten lag between questions and ensuring more complete food and tag lists. Enumerators reported issues with portion size estimation aids and other inputs, including missing foods in the photo atlas, mismatched portions sizes to standard measurements, and difficulty estimating the total amount of a mixed dish after preparation.
Conclusions: The INDDEX24 v.1 mobile app structure holds promise for 24HR surveys across diverse contexts. Ensuring that context-specific inputs are comprehensive and complete before the survey is a challenge regardless of the data collection platform, but is a critical step in the success of any 24HR. The INDDEX24 web app, under development, is envisioned to be a cumulative repository of input data that can, eventually, dramatically reduce the input preparation burden. Results from this study will be used to develop an improved INDDEX24 v.2.
Funding: This research was conducted as part of the International Dietary Data Expansion (INDDEX) Project, which is implemented by Tufts University's Gerald J. and Dorothy R. Friedman School of Nutrition Science and Policy with funding from the Bill & Melinda Gates Foundation.