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Table 4 Summary statistics and intervention effect estimates (intervention minus control) for primary and secondary measures of physical activity

From: Evaluation of an intervention to promote walking during the commute to work: a cluster randomised controlled trial

Outcome Intervention mean (SD) N Controlmean (SD) N Adjusted difference in meansa (95% CI) P-valuea
Baseline Follow-up Baseline Follow-up
Primary
 i) Daily minutes of moderate to vigorous physical activity (MVPA) 55.0
(24.9)
142
53.3
(23.7)
142
57.7
(37.0)
180
53.9
(27.6)
180
0.3 (−5.3, 5.9) 0.917
Secondary
 ii) Overall physical activity (counts per minute) 390.5
(144.2)
142
387.6 (148.5) 142 417.1
(267.4)
180
392.7
(168.8)
180
3.5 (−30.3, 37.4) 0.838
 iii) Sedentary time (minutes per day) 585.5
(63.3)
141
580.0 (97.0) 141 581.9
(80.1)
178
585.4
(108.6)
178
1.0 (−11.7, 13.6) 0.882
 iv) Daily minutes of MVPA during commute 13.9
(14.1)
183
13.8 (14.0) 183 13.3
(15.1)
213
16.2
(19.0)
213
−3.1 (−6.0, −0.2) 0.036
Sensitivity analyses of primary outcome
 Daily minutes of MVPA: 1 day of valid data 52.6
(25.0)
189
51.1 (23.7) 189 55.5
(35.1)
217
52.6
(28.1)
217
−0.4 (−5.3, 4.5) 0.876
  1. aMulti-level mixed effect linear regression model adjusted for size, location and type of business, baseline outcome, accelerometer wear-time at follow-up (for outcomes i and iii) and workplace as a random effect