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

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

Explanatory variables Model A Model B Model C
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
  1. 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)
  2. *Significance at p < 0.05
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