Study 1 Multicentric | Study 2 IBSCC (1995) | Study 3 IBSCC (1999) | ||||
---|---|---|---|---|---|---|
Presence of risk factor | N | % | N | % | N | % |
*The total number in the column is not 806 because of missing values in some of the variables. References: study 1, Muñoz et al (2000)32; study 2, Bosch et al (1995)34; study 3, Walboomers et al (1999).216 | ||||||
HPV, HPV DNA positive; OC, duration of use of hormonal contraceptives >6 years; Preg, ≥5 pregnancies (live or still born); Smk, smoker (ever). IARC, International Agency for Research on Cancer; IBSCC, international biological study on cervical cancer. | ||||||
HPV | 341 | 22.9 | 186 | 23.1 | 186 | 23.1 |
HPV + OC | 54 | 3.6 | 25 | 3.1 | 25 | 3.1 |
HPV + Smk | 115 | 7.7 | 96 | 11.9 | 978 | 12.0 |
HPV + Preg | 587 | 39.4 | 302 | 37.5 | 322 | 40.0 |
HPV + OC + Smk | 20 | 1.3 | 25 | 3.1 | 28 | 3.5 |
HPV + OC + Preg | 72 | 4.8 | 14 | 1.7 | 16 | 2.0 |
HPV + Smk + Preg | 223 | 15.0 | 82 | 10.2 | 88 | 10.9 |
HPV + OC + Smk + Preg | 21 | 1.4 | 7 | 0.9 | 7 | 0.9 |
OC | 2 | 0.1 | 0 | 0 | 0 | 0 |
OC + Smk | 0 | 0 | 3 | 0.4 | 0 | 0 |
OC + Preg | 0 | 0 | 2 | 0.2 | 0 | 0 |
OC + Smk + Preg | 0 | 0 | 0 | 0 | 0 | 0 |
Smk | 8 | 0.5 | 1 | 0.1 | 0 | 0 |
Smk + Preg | 9 | 0.6 | 6 | 0.7 | 0 | 0 |
Preg | 15 | 1.0 | 21 | 2.61 | 1 | 0.1 |
None of the four | 23 | 1.5 | 25 | 3.1 | 2 | 0.2 |
Total number of cases | 1490 | 100 | 806* | 100 | 806* | 100 |