Economic evaluation of a weight control program with e-mail and telephone counseling among overweight employees: a randomized controlled trial

Table 6 Incremental cost-effectiveness ratios and distribution of the joint cost-effect pairs in the cost-effectiveness planes of the internet group resulting from the main analyses and the sensitivity analyses

Analysis	Sample size per group		ΔC (95% CI)	ΔE (95% CI)		Distribution in CE plane (%)
	Control	Internet		Weight loss (kg)	ICER	NE ^b	SE ^c	SW ^d	NW ^e
Main	448	450	14 (−790; 867)	0.9 (−0.1; 1.9)	16	50	48	1	1
Complete cases	134	129	-82 (-838 to 633)	1.3* (0.3; 2.4)	−62	41	58	0	0
Company perspective	448	450	−149 (−858; 618)	0.9 (−0.1; 1.9)	−171	33	65	2	1
				QALY	ICUR
Main	448	450	14 (−774; 887)	0.01 (−0.01; 0.04)	1337	35	47	5	14
Complete cases	120	125	−307 (−1179; 315)	0.02 (−0.02; 0.06)	−27,908	17	71	8	5
Company perspective	448	450	−149 (−858; 618)	0.01 (−0.01; 0.04)	−14,181	23	58	8	11
UK tariff	448	450	14 (−774; 887)	0.02 (−0.02;0.06)	702	41	47	4	9

^a In the analysis ΔC= mean difference in total costs, ΔE= mean difference in outcome, ICER (ICUR) =incremental cost-effectiveness (utility) ratio calculated as ΔC/ΔE. In the main analysis missing data were multiply imputed. The complete cases analysis was restricted to participants with complete cost and effect data. ^b Northeast quadrant of the CE-plane: the intervention is more effective and more costly than self-help brochures. Southeast quadrant of the CE-plane: the intervention is more effective and less costly than self-help brochures. ^d Southwest quadrant of the CE-plane: the intervention is less effective and less costly than self-help brochures. ^e Northwest quadrant of the CE-plane: the intervention is less effective and more costly than self-help brochures. *p=0.01.

ISSN: 1479-5868