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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