Participants
word of mouth
RECRUITMENT, RECRUITMENT, EMA
Participants were recruited to Health@NUS via email, campus posters, and word of mouth. To be eligible, participants had to (1) be a full-time student at the NUS, (2) be aged 18 to 26 years, (3) be a citizen or permanent resident of Singapore, and (4) own a smartphone compatible with the study app (ie, minimum iOS 10 or Android 7). Recruitment was ongoing at the time of writing this paper.There were no additional eligibility criteria for this study. A total of 384 students who joined Health@NUS during the first wave of recruitment between October 2020 and March 2021 were included. During study enrollment, participants provided written informed consent to receive short surveys (EMAs, <10 min each) via the study app (HiSG app). Participants were advised that the EMA surveys were optional but highly encouraged and that they would be compensated for answering them. No specific details of the survey timing, frequency, or the compensation were provided during the consent process.