Table 3

High-risk HPV status after 5 years in a cohort of 576 women - Santiago, Chile

Age

in 2001

years

Number

of

women

Prevalence

Incidence

Persistence

2001

n (%)

2006

n (%)

n (%)

any type

type-specific

n (%)

% of cohort

n (%)

% of cohort

≤ 20

36

5 (13.9)

7 (19.4)

7 (19.4)

0 (0.0)

0.0

0 (0.0)

0.0

21 - 30

84

8 (9.5)

12 (14.3)

12 (14.3)

2 (25.0)

2.4

0 (0.0)

0.0

31 - 40

112

9 (8.0)

9 (8.0)*

7 (6.2)

4 (44.4)

3.6

3 (33.3)

2.7

41 - 50

157

9 (5.7)

21 (13.4)

17 (10.8)

6 (66.7)

3.8

4 (44.4)

2.5

51 - 60

111

12 (10.8)

14 (12.6)*

11 (9.9)

7 (58.3)

6.3

5 (41.7)

4.5

61 - 70

58

5 (8.6)

7 (12.1)*

5 (8.6)

5 (100)

8.6

3 (60.0)

5.2

> 70

18

3 (16.7)

3 (16.7)

0 (0.0)

3 (100)

16.7

3 (100)

16.7

All

576

51 (8.9)

73 (12.7)*

59 (10.2)

27 (52.9)

4.7

18 (35.3)

3.1

Prevalence: women testing positive for one or more high-risk HPV genotypes in a given year.

Incidence: women with one or more newly detected high-risk HPV genotypes in 2006.

Persistence, any type: women testing positive for one or more high-risk HPV genotypes in both 2001 and 2006, regardless of genotype.

Persistence, type-specific: women testing positive for the same high-risk HPV genotype(s) in both 2001 and 2006.

* The number of incident cases plus the number of type-specific persistent cases does not equal the number of prevalent cases because some women have both a persistent high-risk HPV genotype and a newly detected one.

Ferreccio et al. Infectious Agents and Cancer 2011 6:21   doi:10.1186/1750-9378-6-21