Table 2.
Factors associated with willingness to pay for HPV vaccines among Chinese female health workers
| Variables | Initial model | Final model | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Coefficient | Std. Error | t-Statistic | P value | Centered VIF | Coefficient | Std. Error | t-Statistic | P value | Centered VIF | |
| Constant | 1201.70 | 85.43 | 14.07 | < 0.001 | - | 1646.63 | 77.15 | 21.34 | < 0.001 | - |
| Age | -223.82 | 21.86 | -10.24 | < 0.001 | 2.28 | -220.02 | 19.94 | -11.03 | < 0.001 | 1.84 |
| Educational level | 19.15 | 22.78 | 0.84 | 0.401 | 1.19 | - | - | - | - | - |
| Marital status | -202.87 | 33.46 | -6.06 | < 0.001 | 2.43 | -170.07 | 33.57 | -5.07 | < 0.001 | 2.42 |
| Local GDP | 28.90 | 14.28 | 2.02 | 0.040 | 1.42 | 35.36 | 14.31 | 2.47 | 0.008 | 1.41 |
| Local HDI | 54.16 | 24.81 | 2.18 | 0.031 | 1.44 | 58.62 | 24.93 | 2.35 | 0.012 | 1.43 |
| Professional title | -22.86 | 22.89 | -1.00 | 0.317 | 1.77 | - | - | - | - | - |
| Hospital level | 104.22 | 24.38 | 4.27 | < 0.001 | 1.06 | 96.94 | 24.55 | 3.95 | < 0.001 | 1.04 |
| Monthly income (CNY) | 191.72 | 14.77 | 12.98 | < 0.001 | 1.13 | 183.82 | 14.89 | 12.34 | < 0.001 | 1.12 |
| Numbers of children | -95.00 | 21.53 | -4.41 | < 0.001 | 2.35 | -96.18 | 22.03 | -4.37 | < 0.001 | 2.28 |
| Vaccination behavior | 326.46 | 24.94 | 13.13 | < 0.001 | 1.15 | 288.75 | 24.53 | 11.77 | < 0.001 | 1.13 |
Weighted statistics (initial model vs. final model) were determined as follows: R-squared (0.95 vs. 0.95), adjusted R-squared (0.93 vs. 0.94 ), S.E. of regression (1314.94 vs. 1332.48), sum squared resid (2.77E + 10 vs. 2.83E + 10), log likelihood (-137317.4 vs. -137530.5), F-statistic (139.65 vs. 151.68), probability (F-statistic) (< 0.001 vs. < 0.001), mean dependent var (1987.48 vs. 2184.60), S.D. dependent var (1130.41 vs. 1389.13), Akaike info criterion (17.20 vs. 17.23), Schwarz criterion (17.21 vs. 17.23), Hannan-Quinn criter (17.21 vs. 17.23), Durbin-Watson stat (1.96 vs. 1.98)