Variable | Time point | |||||||
---|---|---|---|---|---|---|---|---|
18 months | 24 months | 36 months | 42 months | 48 months | 54 months | 60 months | P valuea | |
Included population number | 866 | 824 | 717 | 634 | 606 | 553 | 497 | Â |
Media device | ||||||||
 Phone | 414 (47.8%) | 471 (57.2%) | 368 (51.3%) | 289 (45.6%) | 284 (46.9%) | 255 (46.1%) | 242 (48.7%) | < 0.001 |
 TV | 585 (67.6%) | 675 (81.9%) | 646 (90.1%) | 572 (90.2%) | 524 (86.5%) | 454 (82.1%) | 350 (70.4%) | < 0.001 |
 iPad | 49 (5.7%) | 101 (12.3%) | 99 (13.8%) | 107 (16.9%) | 137 (22.6%) | 165 (29.85) | 219 (44.1%) | > 0.05 |
 Video game | 0 | 2 (0.2%) | 5 (0.7%) | 1 (0.2%) | 3 (0.5%) | 2 (0.4%) | 5 (1.0%) | > 0.05 |
 Computer | 13 (1.5%) | 15 (1.8%) | 17 (2.4%) | 14 (2.2%) | 19 (3.1%) | 9 (1.65%) | 22 (4.4%) | > 0.05 |
 other | 8 (0.9%) | 18 (2.2%) | 4 (0.6%) | 10 (1.6%) | 9 (1.5%) | 24 (4.3%) | 29 (5.8%) | > 0.05 |
Usage Scenarios | ||||||||
 Education | 114 (13.2%) | 151 (18.35%) | 132 (18.4%) | 135 (21.3%) | 112 (18.5%) | 112 (20.3%) | 160 (32.2%) | 0.105 |
 Soothing when crying | 73 (8.4%) | 89 (10.85%) | 37 (5.2%) | 22 (3.55%) | 8 (1.3%) | 20 (3.6%) | 19 (3.8%) | > 0.05 |
 Substitute caretaker | 99 (11.4%) | 257 (31.2%) | 143 (19.9%) | 91 (14.4%) | 75 (12.4%) | 69 (12.5%) | 36 (7.2%) | > 0.05 |
 Children watching while adults use it | 349 (40.3%) | 229 (27.8%) | 109 (15.2%) | 50 (7.9%) | 58 (9.6%) | 62 (11.2%) | 82 (16.5%) | > 0.05 |
 other | 128 (14.8%) | 248 (30.15%) | 33 (4.6%) | 32 (5.0%) | 57 (9.4%) | 72 (13.0%) | 72 (14.5%) | > 0.05 |
 Limitation on screen time |  |  | 626 (87.3%) | 554 (87.4%) | 558 (92.1%) | 516 (93.3%) | 475 (95.6%) | < 0.001 |