Table 5.
Results of mixed logit model with main effects and interactions.
| Attributes | β | SE | p-Value | 95% CI | |
|---|---|---|---|---|---|
| Non-vaccination | −3.112 | 0.638 | <0.001 | −4.361 | −1.862 |
| Protection rate prevented by a vaccine (ref: 65%) | |||||
| 80% | 0.501 | 0.075 | <0.001 | 0.355 | 0.647 |
| 95% | 1.386 | 0.115 | <0.001 | 1.160 | 1.611 |
| Risk of severe side effect event (ref: high) | |||||
| moderate | 0.794 | 0.077 | <0.001 | 0.643 | 0.944 |
| low | 1.609 | 0.201 | <0.001 | 1.215 | 2.003 |
| Location of vaccine manufacturer (ref: domestic) | |||||
| Imported | −0.403 | 0.091 | <0.001 | −0.582 | −0.224 |
| Duration of vaccine-induced protection (ref: 1 year) | |||||
| 5 years | 0.315 | 0.072 | <0.001 | 0.174 | 0.457 |
| 10 years | 0.517 | 0.096 | <0.001 | 0.329 | 0.706 |
| Out-of-pocket Cost | −0.001 | 0.000 | <0.001 | −0.002 | −0.001 |
| Severity of diseases prevented by vaccines (per 1%) | 0.003 | 0.011 | 0.799 | −0.018 | 0.024 |
| Interaction terms | |||||
| Non-vaccination * working | 0.683 | 0.622 | 0.272 | −0.536 | 1.902 |
| Non-vaccination * age (>30 years old) | 0.584 | 0.458 | 0.203 | −0.315 | 1.482 |
| Non-vaccination * father | −1.576 | 0.585 | 0.007 | −2.723 | −0.428 |
| Non-vaccination * rural | −1.283 | 0.500 | 0.010 | −2.263 | −0.304 |
| Non-vaccination * education level (college and above) | 0.280 | 0.501 | 0.576 | −0.701 | 1.261 |
| Non-vaccination * health state (fair/poor) | −1.899 | 0.854 | 0.026 | −3.573 | −0.224 |
| Lowest risk of severe side effect * education level (college and above) | 0.445 | 0.193 | 0.021 | 0.068 | 0.823 |
| Lowest risk of severe side effect * rural | −0.299 | 0.190 | 0.116 | −0.671 | 0.074 |
| Lowest risk of severe side effect * age (>30 years old) | −0.155 | 0.187 | 0.406 | −0.521 | 0.211 |
| 90% protection rate * age (>30 years old) | −0.362 | 0.143 | 0.012 | −0.642 | −0.081 |
| Protection duration of 10 years * father | 0.433 | 0.204 | 0.034 | 0.033 | 0.833 |
| Imported vaccine * education level (college and above) | 0.468 | 0.124 | <0.001 | 0.225 | 0.712 |
| Log likelihood | −3234.7672 | ||||
| AIC | 6100.574 | ||||
| BIC | 6339.304 | ||||
| Respondents, n | 428 | ||||
| Observations, n | 12840 | ||||
Note: 1. CI—confidence interval. * — the multiplicative relationship which represents the interaction effect of two variables. All attributes except for cost and severity of diseases prevented by vaccines were coded as dummy variables. 2. Interaction terms were treated as fixed effect variables, and the others as random effect variables.