Table 1. Descriptive characteristics of the participants by sleep quality (n, %).
| Variable | Total | Good sleep quality | Poor sleep quality | Chi-Square | p-value |
|---|---|---|---|---|---|
| Gender | |||||
| Boy | 11049(46.27) | 8340(46.99) | 2709(44.21) | 16.259 | <0.001 |
| Girl | 12403(51.95) | 9076(51.13) | 3327(54.30) | ||
| Grade | |||||
| Junior | 11606(48.61) | 9377(52.83) | 2229(36.38) | 500.388 | <0.001 |
| Senior | 12061(50.51) | 8212(46.26) | 3849(62.82) | ||
| Economic status | |||||
| Good | 6509(27.26) | 5174(29.15) | 1335(21.79) | ||
| General | 14504(60.74) | 10771(60.68) | 3733(60.93) | 285.335 | <0.001 |
| Bad | 2781(11.65) | 1746(9.84) | 1035(16.89) | ||
| Academic pressure | |||||
| Low | 3520(11.74) | 2880(16.23) | 640(10.45) | ||
| Middle | 10767(45.09) | 8629(48.61) | 2138(34.89) | 727.178 | <0.001 |
| High | 9564(40.06) | 6220(35.04) | 3344(54.58) | ||
| Relationship with families | |||||
| Good | 18397(77.05) | 14286(80.48) | 4111(67.10) | ||
| Average | 4125(17.28) | 2740(15.44) | 1385(22.60) | 562.180 | <0.001 |
| Bad | 1312(5.49) | 692(3.90) | 620(10.12) | ||
| Relationship with classmates | |||||
| Good | 16552(69.32) | 12872(72.52) | 3680(60.06) | ||
| Average | 6533(27.36) | 4401(24.79) | 2132(34.80) | 371.842 | <0.001 |
| Bad | 711(2.98) | 410(2.31) | 301(4.91) | ||
| Relationship with teachers | |||||
| Good | 11897(49.83) | 9531(53.70) | 2366(38.62) | ||
| Average | 10619(44.47) | 7442(41.93) | 3177(51.85) | 535.645 | <0.001 |
| Bad | 1289(5.40) | 722(4.07) | 567(9.25) | ||
| Smoking | |||||
| Yes | 1284(5.38) | 758(4.27) | 526(8.58) | 165.590 | <0.001 |
| No | 22204(92.99) | 16692(94.04) | 5512(89.96) | ||
| Bullying behaviors | |||||
| Victim | 1410(5.91) | 828(4.66) | 582(9.50) | ||
| Bully | 401(1.68) | 225(1.27) | 176(2.87) | 524.092 | <0.001 |
| Bully-victim | 784(3.28) | 402(2.26) | 382(6.23) | ||
| Neutral | 21282(89.13) | 16295(91.80) | 4987(81.39) | ||