Table 2 Considered attributes and levels for HPV vaccination
| Attributes | Levels |
|---|---|
| Degree of protection against cervical cancer (%) | 50, 70, 90 |
| Duration of protection (yrs) | 6, 25, lifetime |
| Risk of serious side-effects (1 out of…) | 750,000, 150,000, 30,000 |
| Age at vaccination (yrs) | 9, 12, 14 |