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Table 4 Changes in mean daily step count (Fitbit® data) and self-reported physical activity (PA) and sedentary time (IPAQ-assessed) – all participants

From: The Physical Activity Wearables in the Police Force (PAW-Force) study: acceptability and impact

Outcome

Mean change from baseline (week 0)

Mid-intervention

(end of individual phase, week 6)

Post-intervention

(end of social phase, week 12)

Follow-up (month 8)

Mean change (SD)

n = number of observations

95% CI

p-value

Mean change (SD)

n = number of observations

95% CI

p-value

Mean change (SD)

n = number of observations

95% CI

p-value

Mean daily steps

− 214 (2830)

n = 118

− 730 to 302

0.413

78 (2599)

n = 114

− 404 to 561

0.748

−888 (2956)

n = 87

−1518 to −258

0.006*

Total PA (minutes/week)

27.8 (107.1)

n = 157

10.9 to 44.7

0.001

22.7 (111.2)

n = 151

4.8 to 40.6

0.013

18.6 (113.0)

n = 143

−0.1 to 37.2

0.052

Total PA

(MET-minutes/week)

460.3 (2467.5)

n = 157

71.3 to 849.3

0.021

465.4 (2230.9)

n = 151

106.7 to 824.1

0.011

317.7 (2522.0)

n = 143

−99.2 to 734.6

0.134

MVPA

(MET-minutes/week)

271.9 (1685.1)

n = 157

6.3 to 537.6

0.045

402.9 (1698.0)

n = 151

129.9 to 676.0

0.004

420.5 (2202.6)

n = 143

56.4 to 784.6

0.024

Sedentary time (hours on a typical weekday)

−0.12 (3.36)

n = 157

−0.65 to 0.41

0.651

−0.03 (3.45)

n = 151

−0.59 to 0.52

0.906

−0.24 (2.99)

n = 143

−0.73 to 0.26

0.344

  1. Note: SD Standard Deviation; 95% CI 95% Confidence Interval. Pairwise deletion used
  2. p-values where significant (i.e. < 0.05) are highlighted in bold
  3. * The change became non-significant (p = 0.126) with a sensitivity analysis controlling for self-reported events affecting PA level (e.g. illness, annual leave) – see Additional File 4