| Binary 1 | Reference (0) |
Gender | Male (52.7%) | Female |
Academic year (first) | First (28.9%) | ≥Second |
Course | Science (68.7%) | Humanities |
Outcome variable: “How many times did you get infected with COVID-19?” | ≥1 (31.5%) | Un-infected |
COVID-19 vaccine: “How many times did you get vaccinated for COVID-19?” | ≥1 dose (92.2%) | Un-vaccinated |
| ≥2 doses (90.8%) | <2 doses |
| ≥3 doses (66.9%) | <3 doses |
Measles/rubella (MR) vaccine: “Have you got vaccinated for MR more than or equal to twice?” | Yes (72.0%) | No |
Smoking: “Do you smoke?” | Yes (2.8%) | No |
Persistent cough: “Do you have a persistent cough for more than two weeks?” | Yes (0.5%) | No |
BMI low | BMI < 18.5 (14.2%) | BMI ≥ 18.5 |
BMI high | BMI ≥ 25.0 (10.0%) | BMI < 25.0 |
Health concerns including past history abnormalities (4 questions) | Yes (14.1%) | No (every 4 question) |
Club or group activities: “Are you recently joining in club or group activities?” | Yes (40.7%) | No |
Travel activities: “Is your travel activity recently high (≥twice per year)?” | Yes (58.2%) | No |
Karaoke activities: “Is your karaoke activity (group) recently high (≥once per month)?” | Yes (19.8%) | No |
International students: “Are you a student from abroad?” | Yes (2.4%) | No |