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