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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