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

Table 7 Lost earnings, quality of life and commute costs by intervention arm

	Intervention mean (SD) n		Control mean (SD) n		Adjusted difference in means (95% CI)^b	P-value^b
	Post-intervention	Follow-up	Post-intervention	Follow-up	Adjusted difference in means (95% CI)^b	P-value^b
Productivity
Self-assessed productivity	2.230	2.262	2.563	2.853	−0.406	0.019
	(1.872)	(1.827)	(2.173)	(2.450)	(−0.744 to −0.067)
	200	195	263	231
Self-reported days of work missed	1.005	2.013	1.441	1.709	−0.142	0.733
	(2.795)	(6.111)	(5.125)	(4.579)	(−0.961 to 0.677)
	199	194	262	232
Lost earnings
Based on self-assessed productivity	£701.32	£719.30	£891.04	£1056.44	-£231.35	0.019
	(£1067.41)	(£1041.80)	(£1238.79)	(£1397.15)	(−£424.77 to -£37.92)
	200	195	263	231
Based on self-reported days of work missed	£88.16	£176.57	£126.39	£149.92	-£12.50	0.733
	(£245.15)	(£536.05)	(£449.57)	(£401.70)	(−£84.34 to £59.33)
	199	194	262	232
Quality of life
ICECAP-A	0.852	0.840	0.825	0.823	0.018	0.056
	(0.136)	(0.134)	(0.143)	(0.152)	(0.000 to 0.036)
	197	196	264	228
Commuting to work
Commute costs^a		£9.32		£10.99	-£1.15	0.245
		(£7.67)		(£12.19)	(−£3.10 to £0.79)
		140		131

^aCommute costs collected at baseline and 12 months follow-up only
^bBased on a repeated measures analysis that was adjusted for time point as a categorical variable, baseline value, workplace size, workplace location, workplace type and workplace as a random effect

ISSN: 1471-2458