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Table 2 Objectively measured habitual PA and sedentary behaviour for intervention and control groups

From: Children, parents and pets exercising together (CPET): exploratory randomised controlled trial

  Baseline Follow-up 10-week differences
  Intervention mean (SD) Control mean (SD) Intervention mean (SD) Control mean (SD) Difference in change between intervention and control (95% CI) P value** Effect size (Cohen’s d)
Children N = 17 N = 13 N = 17 N = 13    
Total volume (mean cpm)* 521 (112) 524 (144) 548 (216) 521 (147) 30 (-23, 82) 0.62 0.21
% time being sedentary† 80.9 (3.4) 80.2 (4.9) 80.7 (5.0) 80.1 (5.3) -0.1 (-1.8, 2.0) 0.90 0.02
% time in light PA† 16.0 (2.9) 16.7 (3.8) 15.9 (3.6) 16.5 (4.3) 0.1 (-1.5, 1.7) 0.84 0.02
% time in MVPA† 3.1 (1.6) 3.1 (1.9) 3.3 (2.7) 3.0 (1.3) 0.3 (-0.3, 0.9) 0.60 0.20
% time sitting† 56.5 (5.4) 57.0 (7.3) 57.3 (7.7) 56.5 (9.1) 1.3 (-1.6, 4.3) 0.70 0.17
Length of sitting bouts (minutes) 5 (0.5) 6 (1.4) 6 (4.9) 6 (2.1) 1.0 (-0.2. 2.2) 0.66 0.30
Breaks per sitting hour 12.5 (1.4) 12.1 (3.3) 12.0 (2.9) 12.5 (2.9) -0.1 (-1.3, 1.1) 0.60 0.03
% of wear time in bouts > 30 minutes 12.3 (4.9) 15.8 (7.6) 15.2 (15.7) 17.4 (9.7) 1.3 (-3.0, 5.7) 0.90 0.11
Parents N = 15 N = 12 N = 15 N = 12    
Total volume (mean cpm)* 470 (156) 380 (126) 447 (154) 394 (113) -37 (-62, -13) 0.30 0.60
% time being sedentary§ 59.9 (7.7) 58.7 (8.8) 61.0 (7.2) 58.1 (6.70) 2.2 (0., 4.3) 0.18 0.42
% time in light PA§ 33.7 (6.8) 36.3 (7.3) 32.2 (6.3) 36.6 (5.3) -1.9 (-4.0, 0.2) 0.10 0.35
% time in MVPA§ 6.9 (3.0) 5.0 (2.9) 6.9 (3.2) 5.3 (2.4) -0.3 (-1.0, 0.4) 0.96 0.19
Length of sedentary bouts (minutes) 6 (1.2) 6 (2.0) 7 (1.5) 6 (1.6) 1.0 (0.3, 1.2) 0.11 0.60
Breaks per sedentary hour 10.3 (1.8) 10.9 (2.6) 10.0 (1.9) 11.2 (2.2) 0.6 (-0.1, 1.3) 0.20 0.33
% of wear time in outs > 30 minutes 16.2 (6.) 17.6 (9.7) 19.3 (8.9) 16.3 (6.7) 4.4 (1.3, 7.5) 0.18 0.56
Dogs N = 15 N = 12 N = 15 N = 12    
Total volume (mean cpm)* 606 (169) 636 (208) 631 (217) 582 (147) 79 (35, 123) 0.09 0.71
% time being sedentary¶ 85.8 (3.6) 85.6 (4.3) 84.9 (5.2) 85.9 (3.6) -1.2 (-2.3, -0.1) 0.31 0.45
% time in light-moderate PA¶ 12.5 (3.2) 12.7 (3.7) 13.4 (4.3) 12.8 (3.1) 0.9 (-0.2, 1.9) 0.47 0.34
% time in vigorous PA¶ 1.74 (1.0) 1.7 (1.0) 1.8 (1.3) 1.4 (0.8) 0.4 (0.2, 0.6) 0.08 0.70
  1. *cpm = count per minute.
  2. †Sedentary <800 accelerometer cpm; light PA 800–3200 accelerometer cpm; MVPA ≥3200 accelerometer cpm; sitting <150 accelerometer cpm.
  3. §Sedentary <100 accelerometer cpm; light PA 100–1951 accelerometer cpm; MVPA ≥1952 accelerometer cpm.
  4. ¶Sedentary <1352 accelerometer cpm; light-moderate PA 1352–5695 accelerometer cpm; vigorous PA ≥5696 accelerometer cpm.
  5. **Intervention and control groups were compared using analysis of covariance.
  6. Mean duration of accelerometry monitoring at baseline in children was 6.8 days (SD 0.6) with mean duration of 12.2 h (SD 1.6) per day. At follow up mean duration of accelerometry monitoring in children was 6.0 days (SD 1.1) with mean duration of 12.3 h (SD 1.8) per day. Mean duration of accelerometry monitoring in parents at baseline was 6.7 days (SD 0.9) with mean duration of 14.3 h (SD 1.3) per day. At follow up mean duration of accelerometry monitoring in parents was 6.5 days (SD 1.2) with mean duration of 14.0 h (SD 2.0) per day. Mean duration of accelerometry monitoring in dogs at baseline was 6.8 days (SD 0.9) with mean duration of 16.8 h (SD 0.5) per day. At follow up mean duration of accelerometry monitoring in dogs was 6.9 days (SD 0.9) with mean duration of 16.6 h (SD 1.0) per day.
  7. Of the 28 families recruited, 1 parent and 1 dog (from the same family) returned invalid accelerometry data at baseline and were excluded from analysis.