The cost-effectiveness of the RSI QuickScan intervention programme for computer workers: Results of an economic evaluation alongside a randomised controlled trial

Table 6 Total direct costs, effects and the difference in mean costs from a societal perspective.

	Intervention Mean (SD)	Usual care Mean (SD)	Intervention - Usual care Difference costs and effects Mean (95% CI)²
information	(N = 320)	(N = 318)
Total direct costs	166.82 (436.96)	135.73 (294.55)	31.09 (-26.70; 88.88)
Effects (range 0 - 1)	-0.22 (0.51)	-0.10 (0.47)	-0.11 (-0.19; -0.04)
work posture and movement	(N = 315)	(N = 317)
Total direct costs	169.23 (440.00)	136.11 (294.94)	33.12 (-25.32; 91.56)
Effects (range 0 - 11)	-0.96 (1.89)	-0.61 (2.00)	-0.35 (-0.66; -0.05)
arm, neck, shoulder symptoms	(N = 312)	(N = 308)
Total direct costs	170.55 (441.91)	128.11 (276.04)	42.44 (-15.48; 100.36)
Effects (range 0 - 44)	-1.36 (5.49)	-0.77 (5.92)	-0.59 (-1.48; 0.31)
sick leave from paid labour	(N = 320)	(N = 318)
Total direct costs	166.82 (436.96)	135.73 (294.55)	31.09 (-26.70; 88.88)
Effects (days of sick leave)	0.14 (23.71)	-0.30 (23.970)	0.44 (-3.26; 4.14)
Benefits³ (costs of sick leave)	307.71 (3122.17)	227.51 (2847.64)	80.20 (-383.45; 543.86)

Total direct costs and effects per person for the intervention and usual care group and the difference in mean costs (€, 2006 values ¹) between both groups from a societal perspective. Mean costs and effects for the scales "information", "work posture and movement" and "arm, neck, shoulder symptoms are presented over a 12 months period. A negative effect value for these risk factors represents a reduction in exposure and the desired effect. Mean costs and effects for days- and costs of sick leave are presented over a 6 months period. A positive effect or benefit value for sick leave represents an increase in days or costs of sick leave and an undesired effect. ¹ € = US $1.27; ² 95% confidence interval obtained by bias-corrected and accelerated bootstrapping with 5000 replications; ³ Indirect costs for paid labour were calculated according to the friction cost approach on the basis of the mean income of the Dutch population stratified for age and gender [17].

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