| Item | Degree | Grade (%) | Total | χ2 | p | |||
| Freshman | Sophomore | Junior | Senior | |||||
| Depression Severity | Normal | 260 (76.92) | 305 (78.01) | 450 (75.13) | 372 (83.60) | 1387(78.23) | 18.715 | 0.028* |
| Mild | 42 (12.43) | 54 (13.81) | 72 (12.02) | 41 (9.21) | 209(11.79) | |||
| Moderate | 15 (4.44) | 18 (4.60) | 41 (6.84) | 19 (4.27) | 93(5.25) | |||
| Severe | 21 (6.21) | 14 (3.58) | 36 (6.01) | 13 (2.92) | 84(4.74) | |||
| Total | 338 | 391 | 599 | 445 | 1773 | |||