TABLE 4.
Comparison of the detection rate of sleep disorders among students in different groups of universities.
| Group | Sleep disorder | χ2 | |
| Gender | Male | 188 (13.9) | 5.806* |
| Female | 341 (17.0) | ||
| Grade | First year | 212 (12.0) | 47.5** |
| Second year | 196 (17.9) | ||
| Third year or more | 121 (23.9) | ||
| Native place | Urban | 215 (15.4) | 0.178 |
| Rural | 314 (15.9) | ||
| Family economic status | Poor | 212 (20.8) | 28.949** |
| Medium or more | 317 (13.5) | ||
| Major | Literature | 194 (16.1) | 6.570* |
| Science | 99 (18.4) | ||
| Engineering | 137 (13.6) | ||
| Medicine | 99 (16.2) | ||
| Cell phone use time | 1∼4 h | 141 (11.1) | 55.866** |
| 5∼8 h | 265 (16.4) | ||
| 9 h or more | 123 (25.5) | ||
| Cell phone purposeless usage | Occasional | 255 (10.8) | 147.101** |
| Often | 274 (27.4) | ||
| Exercise level | Small | 418 (16.8) | 9.129** |
| Medium | 68 (12.0) | ||
| Large | 43 (13.6) | ||
*P < 0.05, **P < 0.01.