Conclusions
OFD) behaviors, OFD
EVENTS, HEART, EMA
This study showed that mobile EMA is a viable method to capture OFD events and behaviors of its users in near real time, with better results obtained from event-contingent sampling. However, further amendments to the study protocol are necessary to improve compliance and acceptability among participants. In addition, validation of the EMA protocol against gold standard dietary assessment methods such as the 24-hour recall is an important next step. Further research is also essential to support the significant associations found between higher OFD use and those of younger age and those with dependents. This formative work may inform future EMA protocols to capture OFD orders and contextual factors and assist in further understanding OFD use and its impact on diet and health.SJ was supported by a Research Training Program Stipend Scholarship from the Australian Government and the King and Amy O’Malley Trust Foundation Postgraduate Research Scholarship. SRP was supported by a National Heart Foundation Future Leader Fellowship (grant 106646). AAG was supported by an Investigator Grant from the Australian National Health and Medical Research Council (AAP1173784). These sources of support had no involvement in, or restrictions on, publication. The authors would like to express their gratitude to Ursula Power Vudrag, Janne Veija, Kimaya Jambhale, and John Ormerod from the School of Mathematics and Statistics, University of Sydney, for their assistance with the statistical analyses used for this project.Conflicts of Interest: None declared.Adapted Strengthening the Reporting of Observational Studies in Epidemiology (STROBE) Checklist for Reporting EMA Studies (CREMAS).Acceptability of the mobile-based ecological momentary assessment protocol comparing the 2 sampling approaches.Table of online food delivery (OFD) behaviors and contextual data captured from 58 unique participants.