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Table 5 Screen use patterns in Chinese children in Changsha at each time point

From: Prevalence, correlates, and trajectory of screen viewing among Chinese children in Changsha: a birth cohort study

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  
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
  1. Since children could have more than one media device to use every day, the number of cases does not always sum to the included population number
  2. Since children could have more than one usage scenario every day, the number of cases does not always sum to the included population number
  3. aP value was calculated by one-way repeated measures ANOVA