Table 3.
Comparison of sample characteristics between no insomnia group and probable clinical insomnia group (N = 146,102).
| Variables | None N(%) |
Probable clinical insomnia* N(%) |
χ² | Cramer's V |
| Gender | 11.10⁎⁎ | 0.009 | ||
| Female | 84,859(93.6) | 5,842(6.4) | ||
| Male | 52,074(94.0) | 3,327(6.0) | ||
| Grade | 148.46⁎⁎⁎ | 0.032 | ||
| Freshman | 43,255(93.8) | 2,846(6.2) | ||
| Sophomore | 38,244(93.2) | 2,768(6.8) | ||
| Junior | 30,421(93.0) | 2,296(7.0) | ||
| Senior | 17,002(95.4) | 822(4.6) | ||
| Postgraduate | 8,011(94.8) | 437(5.2) | ||
| Residence location | 48.18⁎⁎⁎ | 0.018 | ||
| Rural | 47,225(93.1) | 3,489(6.9) | ||
| Unban | 89,708(94.0) | 5,680(6.0) | ||
| No. of siblings in the family | 0.854 | 0.002 | ||
| 1 | 30,347(93.6) | 2,070(6.4) | ||
| ≥2 | 106,586(93.8) | 7,099(6.2) | ||
| History of physical illness | 66.65⁎⁎⁎ | 0.021 | ||
| Yes | 403(84.7) | 73(15.3) | ||
| No | 136530(93.8) | 9096(6.2) | ||
| History of mental illness | 1136.76⁎⁎⁎ | 0.088 | ||
| Yes | 818(70.0) | 352(30.0) | ||
| No | 136,115(93.9) | 8,817(6.1) | ||
| The severity of the COVID-19 in your area | 11.14⁎⁎ | 0.009 | ||
| Severe | 590(95.3) | 29(4.7) | ||
| Moderate | 124,598(93.7) | 8,433(6.3) | ||
| Mild | 11,745(94.3) | 707(5.7) | ||
| Whether to return to school | 0.003 | 0.001 | ||
| Yes | 8,922(93.7) | 596(6.3) | ||
| No | 128,011(93.7) | 8,573(6.3) | ||
| Daily sleep quantity | 5090.78⁎⁎⁎ | 0.187 | ||
| <5h | 2386(81.5) | 543(18.5) | ||
| 5-6h | 10911(82.0) | 2389(18.0) | ||
| 6-7h | 39213(92.5) | 3169(7.5) | ||
| 7-8h | 61892(96.6) | 2150(3.4) | ||
| >8h | 22531(96.1) | 918(3.9) | ||
| Depressive symptoms | 11603.22⁎⁎⁎ | 0.282 | ||
| Yes | 44,006(84.5) | 8,049(15.5) | ||
| No | 92,927(98.8) | 1,120(1.2) | ||
| Anxiety symptoms | 10794.12⁎⁎⁎ | 0.272 | ||
| Yes | 23,953(80.7) | 5,739(19.3) | ||
| No | 112,980(97.1) | 3,430(2.9) |
⁎
Insomnia is defined as a YSIS score ≥26
⁎⁎
p<0.01
⁎⁎⁎
p<0.001