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Table 2 Change in sedentary/screen behaviour from T1: Primary school to T2: Secondary school

From: Changing from primary to secondary school highlights opportunities for school environment interventions aiming to increase physical activity and reduce sedentary behaviour: a longitudinal cohort study

  Total No change T1 to T2 Increase T1 to T2 Decrease  
Categorical variable N N % N % N % p
Average daily (self-report) leisure screen time (1: ≤ 2 hrs; 2: > 2 hrs) 239 160 67% 47 20% 32 13%  
Usually watch TV/videos (0: No, 1: Yes) 241 194 80% 16 7% 31 13% *
Usually play non-active computer games (0: No, 1: Yes) 242 173 71% 27 11% 42 17%  
Usually use computer for leisure (0: No, 1: Yes) 243 168 69% 49 20% 26 11% *
Usually use computer for homework (0: No, 1: Yes) 243 154 63% 64 26% 25 10% *
   T1: Primary school T2: Secondary school T1 to T2 Difference
Continuous variable N Mean (SD) 95% CI Mean (SD) 95% CI Mean (SD) 95% CI p #
Average daily (mins) sedentary (accelerometer) 127 476 (69) 464, 488 492 (86) 477, 507 16 (76) 2, 29 *
Average daily (mins) weekday leisure screen time (self-report)1 240 135 (111) 120, 149 152 (114) 137, 166 17 (126) 1, 33 *
Average daily (mins) weekend leisure screen time (self-report)1 239 143 (121) 127, 158 158 (160) 138, 179 16 (164) −5, 37  
Average daily (mins) weekday homework screen time (self-report) 241 36 (49) 30, 42 61 (64) 53, 69 25 (67) 16, 33 *
Average daily (mins) weekend homework screen time (self-report) 239 19 (32) 15, 24 31 (45) 26, 37 12 (48) 6, 18 *
  1. CI: confidence interval; SD: standard deviation; * statistical significance at P < 0.05 level.
  2. p , test value for change between T1 & T2 total using exact McNemar or Bowker paired test of proportions.
  3. p #, test value for difference between T1 & T2 total using paired t-test of means.
  4. 1. Daily screen time capped at maximum 8 hours per day as per CLASS guidelines.