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Table 3 Change in child physical activity accelerometer measures between Year 1 and Year 4 by gender for all who participated at Year 1 or Year 4 using multiple imputation of missing values (N = 1837)a

From: Change in children’s physical activity and sedentary time between Year 1 and Year 4 of primary school in the B-PROACT1V cohort

Physical Activity Measure

Boys (N = 899)

Girls (N = 938)

Year 1

Year 4

Change Year 1 to Year 4

Year 1

Year 4

Change Year 1 to Year 4

Mean (SD)

Mean (SD)

Mean (95% CI)

P for difference*

Mean (SD)

Mean (SD)

Mean (95% CI)

P for difference*

Counts per minute overall

747.1 (187.3)

673.1 (211.8)

−74.0 (−103.3, −44.7)

<0.001

685.6 (155.2)

586.8 (186.5)

−98.8 (−119.0, −78.6)

<0.001

 Counts per minute on a weekday

735.1 (184.8)

660.7 (197.0)

−74.4 (−106.7, −42.1)

<0.001

670.6 (152.1)

570.7 (158.4)

−99.9 (−122.3, −77.6)

<0.001

 Counts per minute on a weekend day

769.7 (296.8)

705.9 (351.8)

−63.8 (−120.9, −6.8)

0.03

715.3 (255.9)

614.1 (339.6)

−101.2 (−137.9, −64.5)

<0.001

Average sedentary minutes per day overall

354.1 (58.6)

428.2 (106.6)

74.2 (60.5, 87.9)

<0.001

364.8 (59.7)

448.2 (107.3)

83.4 (70.8, 96.0)

<0.001

 Average sedentary minutes per weekday

362.9 (63.4)

442.4 (111.6)

79.5 (63.3, 95.7)

<0.001

377.5 (66.2)

462.0 (112.1)

84.5 (70.5, 98.5)

<0.001

 Average sedentary minutes per weekend day

339.0 (75.3)

405.3 (122.2)

66.3 (47.2, 85.5)

<0.001

340.6 (74.4)

423.5 (118.3)

82.9 (66.7, 99.1)

<0.001

Average MVPA minutes per day overall

72.4 (20.7)

69.3 (22.7)

−3.0 (−6.4, 0.3)

0.07

62.3 (16.2)

55.6 (17.3)

−6.7 (−9.0, −4.4)

<0.001

 Average MVPA minutes per weekday

73.2 (22.2)

69.6 (22.8)

−3.6 (−7.2, 0.0)

0.05

62.6 (17.8)

56.6 (18.8)

−6.0 (−8.6, −3.4)

<0.001

 Average MVPA minutes per weekend day

70.9 (28.6)

69.0 (34.7)

−1.8 (−7.2, 3.6)

0.49

61.6 (22.4)

53.6 (25.4)

−8.0 (−11.4, −4.5)

<0.001

  1. a78 children had no valid accelerometer data at either time point; 596 had valid data at Year 1 but not Year 4 (456 complete), 557 had valid data at Year 4 but not Year 1 (439 complete); 606 had valid data at both time points (67 complete for Year 4 only, 70 complete for Year 1 only, 446 complete for both years (included in Additional file 2: Table S2)
  2. * P-value obtained from a paired t-test that the difference in the means of the Year 1 and Year 4 values is 0, using robust standard errors to account for clustering by school