This Study
EMA
To evaluate these changes, we implemented 2 randomized controlled trials (RCTs) within the ongoing Health@NUS study. The practical nature of these nested RCTs (ie, to act to improve overall EMA survey response rate in an ongoing study) meant that publishing a protocol before starting the study was not feasible. The outcome variable (response rate) was specified Flow of participants through the nested randomized controlled trials. HP: Health Points.