Table 2. Estimated relative protection and coverage for vaccination at different ages relative to girls vaccinated at age 12–13.
| Year of birtha | Age at vaccination (third dose) | Relative protection compared to those vaccinated aged 12–13b (%) | Relative coverage compared to those aged 13c (%) |
|---|---|---|---|
| 1996 or after | 13 | 100 | 100 |
| 1995 | 15 | 97 | 95 |
| 1994 | 16 | 92 | 75 |
| 1993 | 17 | 77 | 50 |
| 1992 | 18 | 70 | 50 |
| 1991 | 18 | 70 | 50 |
| 1990 or before | Not vaccinated | 0 | 0 |
No protection against invasive cervical cancer from catch-up within 8 years of vaccination.
a
For example, a year of birth of 1994 means September 93 to August 94 and assumes that the majority would have a birthday by the third dose.
b
Lower protection comes primarily from some teenagers being infected with either type 16 or 18 HPV before vaccination.
c
Lower coverage (particularly for those born in 1991–1993) is due to the non-school-based vaccine programmes.