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Table 4 Change in parent physical activity accelerometer measures between Year 1 and Year 4 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 Female parent (N = 1837) Male parent (N = 1837)
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 405.9 (141.4) 399.5 (139.5) −6.4 (−17.2, 4.4) 0.23 409.1 (144.0) 419.8 (164.8) 10.7 (−14.2, 35.5) 0.37
 Counts per minute on a weekday 420.0 (141.9) 415.0 (141.7) −5.0 (−17.5, 7.4) 0.42 415.3 (167.6) 421.3 (178.6) 6.1 (−30.2, 42.3) 0.72
 Counts per minute on a weekend day 383.1 (217.7) 372.9 (210.5) −10.2 (−30.8, 10.3) 0.31 397.2 (256.2) 423.2 (257.2) 26.0 (−40.4, 92.4) 0.39
Average sedentary minutes per day overall 509.2 (77.1) 535.0 (106.1) 25.8 (16.2, 35.3) <0.001 546.0 (92.1) 555.5 (113.3) 9.5 (−11.8, 30.9) 0.34
 Average sedentary minutes per weekday 523.0 (91.4) 547.9 (118.9) 24.9 (13.5, 36.3) <0.001 565.8 (117.2) 571.0 (133.2) 5.2 (−22.0, 32.5) 0.68
 Average sedentary minutes per weekend day 485.8 (101.5) 510.7 (128.1) 24.9 (5.8, 43.9) 0.01 518.3 (127.1) 528.4 (160.2) 10.1 (−25.3, 45.6) 0.54
Average MVPA minutes per day overall 48.2 (19.7) 48.5 (20.1) 0.3 (−1.1, 1.8) 0.67 51.0 (21.7) 54.1 (24.1) 3.0 (−0.2, 6.2) 0.06
 Average MVPA minutes per weekday 52.7 (24.3) 52.6 (24.7) −0.1 (−2.1, 1.9) 0.94 54.5 (28.7) 56.8 (32.3) 2.3 (−2.6, 7.1) 0.33
 Average MVPA minutes per weekend day 41.1 (26.5) 41.6 (25.8) 0.5 (−2.5, 3.5) 0.73 45.6 (36.7) 49.4 (37.6) 3.8 (−8.8, 16.4) 0.49
  1. 1016 children had no valid male parent accelerometer data; 361 had valid data for Year 1 but not Year 4 (321 complete); 323 had valid data for Year 4 but not Year 1 (281 complete); 137 had valid data at both time points (6 complete for Year 4 only, 9 complete for Year 1 only, 122 complete in both years (included in Additional file 3: Table S3))
  2. a558 children had no valid female parent accelerometer data; 524 had valid data for Year 1 but not Year 4 (456 complete); 436 had valid data for Year 4 but not Year 1 (379 complete); 319 had valid data at both time points (21 complete for Year 4 only, 21 complete for Year 1 only, 268 complete in both years (included in Additional file 3: Table S3))
  3. * 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