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Table 4 Levels of screen time and outdoor play in children at each time point

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

Variable Time point
12 months 18 months 24 months 36 months 42 months 48 months 54 months 60 months
Prevalence of children’s interest in screen use F = 11,164.509 P <  0.001a       
Included population number 917 866 824 717 634 606 553 497
 NO 139 (15.2%) 123 (14.2%) 48 (5.8%) 16 (2.2%) 7 (1.1%) 5 (0.5%) 7 (1.3%) 12 (2.4%)
 Occasionally 205 (22.4%) 263 (30.4%) 268 (32.5%) 81 (11.3%) 81 (12.8%) 74 (12.2%) 69 (12.5%) 85 (17.1%)
 Sometimes     133 (18.5%) 161 (25.4%) 149 (37.6%) 110 (13.7%) 117 (23.5%)
 Often 573 (62.4%) 480 (55.45%) 508 (61.7%) 292 (40.7%) 283 (44.6%) 248 (40.9%) 225 (40.7%) 217 (43.7%)
 Always     195 (27.2%) 102 (16.1%) 130 (21.5%) 142 (25.7%) 66 (13.3%)
Prevalence of children’s acceptance of AAP F = 278.488 P <  0.001a       
Included population number 879 692 729 695 561 466 504 466
 Not using media device 530 (60.3%) 105 (15.2%) 20 (2.7%) 8 (1.2%) 12 (2.1%) 8 (1.7%) 12 (2.4%) 17 (3.6%)
 Accepting AAP recommendation 530 (60.3%) 105 (15.2%) 580 (79.6%) 506 (72.8%) 450 (80.2%) 380 (81.5%) 422 (83.7%) 371 (79.6%)
 Exceeding AAP recommendation 349 (39.7%) 587 (84.8%) 149 (20.4%) 189 (27.2%) 111 (19.8%) 86 (18.5%) 82 (16.3%) 95 (20.4%)
Children’s daily screen time F = 481.461 P <  0.001a       
Included population number 879 692 729 695 561 466 504 466
Children’s screen time (hours/day) 0.23 (0.66) 0.61 (0.91) 1.02 (0.94) 1.40 (2.14) 1.27 (1.22) 1.27 (1.55) 1.13 (1.00) 1.40 (2.00)
Children’s daily outdoor activity time F = 5505.670 P <  0.001a       
Included population number 918 835 787 721 624 598 553 486
Children’s outdoor activity time (hours/day) 2.58 (1.17) 2.96 (1.17) 2.73 (1.23) 2.58 (1.25) 2.02 (0.85) 1.93 (0.69) 1.90 (0.75) 1.87 (0.94)
  1. aP value was calculated by one-way repeated measures ANOVA