An exploratory study to estimate cost-effectiveness threshold value for life saving treatments in western Iran

Table 4 Marginal effects of factors affecting on WTP per QALY values

Explanatory variables	Model A		Model B		Model C
Explanatory variables	Pr	E	Pr	E	Pr	E
Age, year	− 0.003	− 15.5	0.003	− 13.7	− 0.000	− 0.5
Sex (ref. male)
Female	0.093*	515.1*	0.082*	388.3*	0.043	202.4
Marital status (ref. single)
Married	0.021	114.6	0.016	78.5	0.052	242.8
Others	0.106	626.9	0.035	168.7	0.116	583.7
Education status (ref. academic degree)
Illiterate	0.204*	1334.9*	0.158*	848.5*	0.058	299.8
Primary and secondary school	− 0.016	− 87.2	− 0.036	− 167.8	− 0.071*	− 333.9*
Health insurance coverage (ref. No.)
Yes	0.051	289.4	0.073	344.4	− 0.001	− 6.85
Birth place (ref. rural)
Urban	0.085*	460.7*	0.072*	330.1*	0.044	203.2
Monthly income US$ (ref. less than 78)
US$ 78 – 155	0.064	354.1	0.037	171.1	0.031	140.7
US$ 156–310	0.113*	641.9*	0.078*	371.5*	0.070*	330.4*
More than US$ 310	0.175*	1044.6*	0.153*	775.9*	0.123*	620.4*
Having chronic disease (ref. no.)
Yes	0.004	24.7	0.030	145.1	− 0.003	15.8
Family member with chronic diseases such as cancer (ref.no.)
Yes	0.041	230.2	0.026	120.8	0.036	169.9
Family member died in the last year (ref.no.)
Yes	0.034	193.3	0.037	175.5	0.054	253.2

Model A Dependent variable is WTP per QALY using EQ-5D-3L, Model B Dependent variable is WTP per QALY using VAS, Model C Dependent variable is WTP per QALY for family member, Pr shows the marginal effects for the probability of being uncensored and E indicates the marginal effects for the expected WTP per QALY value conditional on being uncensored: E (WTP per QALY | WTP per QALY > 0)
*Significance at p < 0.05

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