Sociodemographic characteristics We collected data on the participants age, gender, ethnicity (Chinese, Malay, Indian, other), education level categorized as primary (PSLE, no formal qualifications), secondary (O/N level, NTC 3 or equivalent) pre-university (A level, NTC 12 or equivalent, polytechnic or other diploma) or university and above, and monthly household income in SGD ($2000, $2000$5999, $6000$9999, $10000) (SGD: 1000 Singapore dollars about US$750)
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