Table 2.
Probit model and WTP in the common disease scenario
| Exploratory variables | Model 1 (without covariates) a | Model 2 (reduced model) b | Model 3 (full model) c | |||
|---|---|---|---|---|---|---|
| Coefficient | 95% CI | Coefficient | 95% CI | Coefficient | 95% CI | |
| Bid | − 0.000013*** | (− 0.000015, − 0.000012) | − 0.000014*** | (− 0.000015, − 0.000012) | − 0.000014*** | (− 0.000015, − 0.000012) |
| Female | – | – | 0.278** | (0.026, 0.529) | 0.294** | (0.039, 0.550) |
| Working experience (senior) | – | – | – | – | 0.009 | (− 0.275, 0.293) |
| Expertise in health insurance | – | – | 0.240* | (− 0.010, 0.490) | 0.288** | (0.015, 0.561) |
| Expertise Pharmacy | – | – | – | – | 0.208 | (− 0.150, 0.566) |
| Expertise in Pharmacoeconomics | – | – | 0.386** | (0.085, 0.686) | 0.465*** | (0.134, 0.795) |
| South | – | – | – | 0.014 | (− 0.270, 0.298) | |
| Western | – | – | – | − 0.070 | (− 0.477, 0.338) | |
| constant term | 1.656*** | (1.473, 1.839) | 1.148*** | (0.831, 1.465) | 1.062*** | (0.397, 1.728) |
| WTP | 126,449.4*** | (116,603.4, 136,295.4) | 84,543.21*** | (61,501.33, 107,585.1) | 78,030.92*** | (29,209.58, 126,852.3) |
a Model 1 includes response as the explained variable and Bid as the main exploratory variable; no other covariates are included in the model. b Model 2 is the reduced model, with the lowest AIC and three covariates. c Model 3 is the full model
*p < 0.1; **p < 0.05; ***p < 0.01