Age (y)
|
<25 | 293 | 16.2 | 19 | 6.5 | 1.7 (0.87 to 3.1) | 1.6 (0.7 to 3.5) |
25–29 | 360 | 19.9 | 14 | 3.9 | 1.0 (0.5 to 1.9) | 0.8 (0.4 to 1.8) |
30–34 | 433 | 23.9 | 34 | 7.9 | 2.0 (1.2 to 3.6) | 1.8 (0.98 to 3.2) |
35–44 | 522 | 28.8 | 21 | 4.0 | 1 | 1 |
45+ | 205 | 11.3 | 3 | 1.5 | 0.4 (0.1 to 1.2) | 0.2 (0.06 to 1.1) |
Education
|
None/low | 689 | 38.0 | 31 | 4.5 | 1 | 1 |
Intermediate | 668 | 36.9 | 30 | 4.5 | 0.8 (0.4 to 1.3) | 0.8 (0.4 to 1.4) |
High | 455 | 25.1 | 30 | 6.6 | 1.3 (0.7 to 2.0) | 1.2 (0.7 to 2.5) |
Missing | 1 | 0.06 | 0 | 0.0 | | |
Age at 1st sexual intercourse (y)
|
⩾20 | 686 | 37.8 | 27 | 3.9 | 1 | 1 |
17–19 | 633 | 34.9 | 39 | 6.2 | 1.5 (0.92 to 2.6) | 1.3 (0.8 to 2.3) |
⩽16 | 494 | 27.3 | 25 | 5.1 | 1.3 (0.7 to 2.2) | 1.3 (0.6 to 2.4) |
Lifetime number of regular sexual partners§
|
1 | 1341 | 74.0 | 66 | 4.9 | 1 | 1 |
2 | 309 | 17.0 | 14 | 4.5 | 0.9 (0.5 to 1.7) | 0.9 (0.5 to 1.6) |
3 | 62 | 3.4 | 3 | 4.8 | 1.1 (0.3 to 3.7) | 1.0 (0.3 to 3.3) |
Missing | 101 | 5.6 | 8 | 7.9 | | |
Ever had a casual sexual partner¶
|
No | 1302 | 71.8 | 61 | 4.7 | 1 | 1 |
Yes | 428 | 23.6 | 23 | 5.4 | 1.1 (0.7 to 1.8) | 1.0 (0.6 to 1.8) |
Missing | 83 | 4.6 | 7 | 8.4 | | |
Parity
|
0 | 115 | 6.3 | 6 | 5.2 | 1 | 1 |
1–2 | 944 | 52.1 | 52 | 5.5 | 1.1 (0.4 to 2.6) | 1.5 (0.5 to 4.4) |
⩾3 | 754 | 41.6 | 33 | 4.4 | 1.0 (0.4 to 2.6) | 1.5 (0.5 to 5.0) |
Oral contraceptives
|
Never used | 886 | 48.9 | 48 | 5.4 | 1 | 1 |
Former user | 741 | 40.9 | 30 | 4.1 | 0.7 (0.4 to 1.2) | 0.7 (0.4 to 1.2) |
Current user | 163 | 9.0 | 12 | 7.4 | 1.2 (0.6 to 2.3) | 1.4 (0.7 to 2.7) |
Missing | 23 | 1.3 | 1 | 4.4 | | |
Duration of oral contraceptive use
|
<3 years | 544 | 30.0 | 21 | 3.9 | 0.7 (0.4 to 1.1) | 0.7 (0.4 to 1.2) |
⩾3 years | 287 | 15.8 | 17 | 5.9 | 1.1 (0.6 to 2.0) | 1.2 (0.6 to 2.1) |
Missing duration | 73 | 4.0 | 4 | 5.5 | | |
IUD
|
Never used | 710 | 39.2 | 36 | 5.1 | 1 | 1 |
Former user | 572 | 31.6 | 29 | 5.1 | 1.0 (0.6 to 1.7) | 1.1 (0.6 to 1.8) |
Current user | 500 | 27.6 | 26 | 5.2 | 0.9 (0.5 to 1.5) | 0.9 (0.5 to 1.5) |
Missing | 31 | 1.7 | 0 | 0.0 | | |
Condom
|
Never | 1212 | 66.9 | 59 | 4.9 | 1 | 1 |
Ever | 572 | 31.6 | 32 | 5.6 | 1.1 (0.7 to 1.7) | 1.0 (0.7 to 1.9) |
Missing | 29 | 1.6 | 0 | 0.0 | | |
Smoking
|
Never | 1300 | 71.7 | 61 | 4.7 | 1 | 1 |
Former smoker | 215 | 11.9 | 10 | 4.7 | 1.1 (0.5 to 2.2) | 1.1 (0.6 to 2.3) |
Current smoker | 298 | 16.4 | 20 | 6.7 | 1.4 (0.8 to 2.4) | 1.1 (0.6 to 2.1) |