Table 4. Incremental costs and effects per abstinent smoker and per QALY gained for the video-, text-based and control condition with a willingness-to-pay threshold of €18,000.

Intervention
Prolonged abstinence a	Costs per respondent	Abstinence	Incremental costs (€)	Incremental abstinence b	Incremental costs c
Control	4,879	1.06	-	-	-
Video vs. Control	4,939	1.10	60	0.04	1,500
Text vs. Control	5,383	1.07	504	0.01	50,400
Video vs. Text			444	−0.03	dominated d
QALY (EQ-5D-3L) e	Costs per respondent	Quality of life	Incremental costs (€)	Incremental quality of life	Incremental costs per QALY
Control	4,879	0.83	-	-	-
Video vs. Control	4,939	0.83	60	0.001	60,000
Text vs. Control	5,383	0.83	504	−0.002	dominated
Video vs. Text			444	−0.003	dominated

^acoded as 2 =  prolonged abstinent and 1 not prolonged abstinent,

^bincremental number of abstinence/QALY,

^cper abstinent respondent, calculated according to the formula ICER/ICUR = (Ci-Cc)/Ei-Ec),

^ddominated =  less costs, more effects compared to the other condition,

^ebased on the Dutch algorithm for the EQ-5D-3L scores.