Age (per year) | | 1.4 (0.9 to 2.3) | 0.15 |
Frequency of sex (per group) | | 1.1 (0.5 to 2.0) | 0.88 |
Douches | | 0.6 (0.2 to 1.9) | 0.36 |
Has intercourse during menses | | 0.5 (0.2 to 1.8) | 0.29 |
Became sexually active within the past 12 months | | 0.2 (0.1 to 0.7) | 0.004 |
No condom at last sex | | 0.8 (0.3 to 2.0) | 0.57 |
Lifetime partners (per group) | | 1.0 (0.6 to 1.5) | 0.95 |
Tanner breast stage (per stage) | | 1.5 (0.7 to 3.2) | 0.27 |
Presence of cervical ectopy | | 2.5 (1.0 to 6.6) | 0.05 |
Disturbed menstrual cycle‡ | | 0.7 (0.3 to 1.9) | 0.50 |
Body mass index (per kg/m2) | | 1.0 (0.9 to 1.1) | 0.70 |
Gynaecological age (per year) | | 1.0 (0.8 to 1.4) | 0.81 |
Uses oral contraceptives | | 1.3 (0.5 to 3.5) | 0.59 |
Ever used Depo-Provera | | 0.1 (0.0 to 0.7) | 0.003 |
Current or past smoker | | 1.5 (0.5 to 4.7) | 0.51 |
Previous STI treatment | | 2.5 (0.9 to 6.5) | 0.07 |
Current intermenstrual bleeding | | 2.3 (0.5 to 10.3) | 0.28 |