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Table 5 Subgroup analyses of primary outcome

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

Outcome Intervention mean (SD) n Control mean (SD) n Adjusted difference in means between control and intervention within subgroup* (95% CI) Interaction test P-value*
Baseline Follow-up Baseline Follow-up
Daily minutes of moderate to vigorous physical activity (MVPA)
Age (<median) 55.2
(23.2)
61
56.3
(24.7)
61
63.2
(46.7)
77
60.6
(26.8)
77
−1.9 (−9.8, 6.0)  
Age (≥median) 54.9
(26.3)
81
51.0
(22.8)
81
53.6
(27.2)
103
48.9
(27.2)
103
1.6 (−5.5,8.6) 0.496
Sex (Male) 58.1
(24.8)
57
56.4
(23.7)
57
61.8
(50.1)
71
56.0
(31.3)
71
1.5 (−6.8, 9.9)  
Sex (Female) 53.0
(24.9)
85
51.1
(23.6)
85
55.0
(24.9)
109
52.6
(25.0)
109
−0.8 (−7.7, 6.2) 0.664
Household income (below £30,000 or missing) 52.4
(24.2)
32
54.4
(23.2)
32
54.6
(25.5)
41
53.8
(24.6)
41
2.6 (−8.3, 13.5)  
Household income (above £30,000) 55.8
(25.2)
110
52.9
(24.0)
110
58.6
(39.8)
139
54.0
(28.5)
139
−0.4 (−6.6, 5.8) 0.628
Distance from work (2 km or less) 58.7
(26.3)
20
57.2
(25.4)
20
59.9
(22.7)
12
64.5
(34.0)
12
−6.8 (−23.2, 9.7)  
Distance from work (more than 2 km) 54.7
(24.7)
121
52.9
(23.4)
121
57.3
(38.0)
164
53.1
(27.1)
164
0.4 (−5.5, 6.3) 0.419
  1. *Multi-level mixed effect linear regression model adjusted for size, location and type of business, baseline outcome, accelerometer wear-time at follow-up and workplace as a random effect