TABLE 1.
% of | Prevalence | |||
Group | N | sample | (95% CI) | Unadjusted OR |
Sociodemographic factors | ||||
Age (years) | ||||
<20 | 1,894 | 15.8 | 20.7 (18.9–22.6) | 1.00 |
20– | 2,392 | 20.0 | 20.9 (19.2–22.5) | 1.01 (0.87–1.17) |
21– | 2,762 | 23.1 | 23.3 (21.7–24.8) | 1.16 (1.01–1.33)* |
22– | 2,450 | 20.5 | 22.3 (20.6–24.0) | 1.10 (0.95–1.27) |
23– | 2,456 | 20.5 | 26.1 (24.4–27.8) | 1.35 (1.17–1.56)** |
Gender | ||||
Male | 4,253 | 35.6 | 19.6 (18.4–20.8) | 1.00 |
Female | 7,701 | 64.4 | 24.5 (23.5–25.5) | 1.33 (1.21–1.46)** |
Grade | ||||
1–2 | 4,945 | 41.4 | 21.3 (20.2–22.5) | 1.00 |
3–4 | 6,717 | 56.2 | 23.6 (22.5–24.6) | 1.14 (1.04–1.24)** |
5– | 292 | 2.4 | 29.1 (23.9–34.4) | 1.51 (1.17–1.97)** |
Ethnicity | ||||
Han | 11,148 | 93.3 | 22.9 (22.1–23.6) | 1.00 |
Minority | 806 | 6.7 | 21.5 (18.6–24.4) | 0.93 (0.78–1.10) |
Major | ||||
Medical | 10,507 | 87.9 | 23.2 (22.4–24.0) | 1.22 (1.06–1.40)** |
Others | 1,447 | 12.1 | 19.8 (17.8–21.9) | 1.00 |
Monthly expenditure | ||||
<1,000 | 1,299 | 10.9 | 22.6 (20.3–24.8) | 1.00 |
1,000–1499 | 6,165 | 51.6 | 24.3 (23.2–25.3) | 1.10 (0.95–1.27) |
1,500–1,999 | 3,506 | 29.3 | 20.5 (19.1–21.9) | 0.89 (0.76–1.03) |
2,000 and more | 984 | 8.2 | 21.5 (18.9–24.1) | 0.94 (0.77–1.15) |
Father’ s occupation | ||||
Operation and commercial work | 9,457 | 79.1 | 22.9 (22.0–23.7) | 1.00 |
Staff and administration | 1,741 | 14.6 | 21.9 (20.0–23.9) | 0.95 (0.84–1.07) |
Professionals | 756 | 6.3 | 23.1 (20.1–26.2) | 1.02 (0.85–1.21) |
Mother’s occupation | ||||
Operation and commercial work | 9,600 | 80.3 | 23.1 (22.2–23.9) | 1.00 |
Staff and administration | 1,548 | 12.9 | 21.3 (19.2–23.4) | 0.90 (0.79–1.03) |
Professionals | 806 | 6.7 | 22.0 (19.1–24.9) | 0.94 (0.79–1.12) |
University contextual factors | ||||
University location | ||||
East | 6,615 | 55.3 | 21.8 (20.8–22.9) | 1.00 |
Middle | 3,524 | 29.5 | 23.9 (22.5–25.3) | 1.12 (1.02–1.24)* |
West | 1,815 | 15.2 | 23.8 (21.8–25.8) | 1.12 (0.99–1.26) |
Type of university | ||||
High level | 4,295 | 35.9 | 21.1 (19.9–22.3) | 1.00 |
Middle and low level | 7,659 | 64.1 | 23.7 (22.8–24.7) | 1.17 (1.07–1.28)** |
Psychological factors | ||||
Study stress | ||||
Low score | 9,636 | 80.6 | 20.0 (19.2–20.8) | 1.00 |
High score | 2,318 | 19.4 | 34.2 (32.3–36.2) | 2.08 (1.88–2.30)** |
Life stress | ||||
Low score | 10,960 | 91.2 | 21.6 (20.9–22.4) | 1.00 |
High score | 1,048 | 8.8 | 34.5 (31.6–37.4) | 1.91 (1.67–2.19)** |
Uncertainty stress | ||||
Low score | 9,614 | 80.4 | 19.2 (18.4–20.0) | 1.00 |
High score | 2,340 | 19.6 | 37.6 (35.6–39.5) | 2.54 (2.30–2.80)** |
*p < 0.05; **p < 0.001.