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Table 5 The intervention effect on physical activity variables during school hours stratified by study group and gender. The results are presented as mean differences in change (intervention arms vs controls) with 95% CI, P-values and ICC for school

From: The effect of a school-based intervention on physical activity, cardiorespiratory fitness and muscle strength: the School in Motion cluster randomized trial

 

n

Mean difference in change (95% CI)a

P

ICC

Girls

 PAL-intervention

 Average PA (cpm)

643

92.3 (52.2, 132.5)

< 0.001

0.10

 MVPA (min/day)

643

6.3 (3.8, 8.8)

< 0.001

0.13

 Sedentary (min/day)

643

−7.4 (−11.9, −2.8)

0.001

0.08

 DWBH-intervention

 Average PA (cpm)

568

−9.4 (−53–0, 34.0)

0.670

0.10

 MVPA (min/day)

568

1.0 (−1.6, 3.7)

0.462

0.13

 Sedentary (min/day)

568

6.7 (1.8, 11.6)

0.007

0.08

Boys

 PAL-intervention

 Average PA (cpm)

574

76.6 (18.8, 134)

0.009

0.09

 MVPA (min/day)

574

5.1 (1.5, 8.6)

0.005

0.13

 Sedentary (min/day)

574

−0.5 (−6.6, 5.6)

0.878

0.12

 DWBH-intervention

 Average PA (cpm)

521

−49.9 (− 110.5, 10.5)

0.106

0.09

 MVPA (min/day)

521

−0.4 (−4.1, 3.3)

0.842

0.13

 Sedentary (min/day)

521

13.2 (6.7, 19.8)

< 0.001

0.12

  1. PAL Physically active learning; DWBH Don’t worry – Be happy; PA Physical activity; MVPA Moderate-to-vigorous physical activity, min Minutes, cpm Counts per minute, CI Confidence interval; ICC Intraclass correlation coefficient
  2. aEach model contained fixed effects for intervention, time (baseline – follow-up) and intervention x time interaction, in addition to random effects for school, class and subject ID