Variables | Total | High ADHD symptoms [n (%)] | χ 2 | P |
---|---|---|---|---|
Age | ||||
 3 year | 3396 | 344 (10.1) | 32.80 | < 0.001 |
 4 year | 4525 | 436 (9.6) |  |  |
 5 year | 4442 | 331 (7.5) |  |  |
 6 year | 2928 | 206 (7.0) |  |  |
Gender | ||||
 Male | 8218 | 811 (9.9) | 35.59 | < 0.001 |
 Female | 7073 | 506 (7.2) |  |  |
Only child | ||||
 Yes | 11,402 | 1005 (8.8) | 2.31 | 0.129 |
 No | 3889 | 312 (8.0) |  |  |
Household registration | ||||
 Rural | 5857 | 582 (9.9) | 21.14 | < 0.001 |
 Urban | 9434 | 735 (7.8) |  |  |
Maternal age | ||||
  ≤ P25 (28 year) | 3867 | 459 (11.9) | 71.12 | < 0.001 |
 P25~ P75 (29~ 34 year) | 7083 | 549 (7.8) |  |  |
  ≥ P75 (34 year) | 4341 | 309 (7.1) |  |  |
Maternal education | ||||
 Middle school or below | 6485 | 684 (10.5) | 73.76 | < 0.001 |
 Senior high school or junior college | 6480 | 518 (8.0) |  |  |
 University or above | 2326 | 115 (4.9) |  |  |
Paternal age | ||||
  ≤ P25 (31 year) | 4592 | 506 (11.0) | 48.38 | < 0.001 |
 P25~ P75(31~ 37 year) | 6616 | 497 (7.5) |  |  |
  ≥ P75(37 year) | 4083 | 314 (7.7) |  |  |
Paternal education | ||||
 Middle school or below | 5253 | 538 (10.2) | 44.33 | < 0.001 |
 Senior high school or junior college | 7207 | 612 (8.5) |  |  |
 University or above | 2831 | 167 (5.9) |  |  |
Monthly household income per capita(yuan/RMB) | ||||
 999 or less | 744 | 61 (8.2) | 0.71 | 0.701 |
 1000~ 2999 | 7047 | 596 (8.5) |  |  |
 3000 or more | 7500 | 660 (8.8) |  |  |
TV viewing time on weekday | ||||
 <1 h/d | 4089 | 262 (6.4) | 34.49 | < 0.001 |
  ≥ 1 h/d | 11,202 | 1055 (9.4) |  |  |
TV viewing time on weekend | ||||
 <2 h/d | 5395 | 352 (6.5) | 46.19 | < 0.001 |
  ≥ 2 h/d | 9896 | 965 (9.8) |  |  |
Outdoor activities | ||||
 Often | 8210 | 672 (8.2) | 16.52 | < 0.001 |
 Sometimes | 5787 | 495 (8.6) |  |  |
 Seldom | 1294 | 150 (11.6) |  |  |