Baseline characteristics at enrolment of the 6322 unvaccinated young adult women (18–32 years) included in the analysis
Characteristics | N (%) |
Sexual behaviour | |
Sexual debut | |
Yes | 5447 (86.2) |
No | 875 (13.8) |
Age at first sexual intercourse (years) (among sexually active) | |
Mean | 17.3 |
SD | 2.9 |
Range | 4–33 |
Median | 17 |
IQR | 15–19 |
Lifetime number of sexual partners | |
0 | 875 (13.9) |
1 | 2012 (32.0) |
2–3 | 2218 (35.3) |
4+ | 1186 (18.9) |
Monthly frequency of sexual intercourse since the last visit (among sexually active) | |
1 or less | 774 (14.4) |
2–4 | 1360 (25.4) |
5–9 | 1229 (22.9) |
10–13 | 1261 (23.5) |
14+ | 738 (13.8) |
Married/Living as married | |
Yes | 3399 (53.9) |
No | 2910 (46.1) |
Contraceptive use (among sexually active) | |
Use of oral contraceptives | |
Never | 1093 (20.3) |
Ever | 4289 (79.7) |
Use of injectable contraceptives | |
Never | 2706 (50.4) |
Ever | 2665 (49.6) |
Use of condom | |
Never | 2153 (39.7) |
Ever | 3269 (60.3) |
Use of other contraceptive method* | |
Never | 4668 (85.9) |
Ever | 767 (14.1) |
Number of full-term pregnancies | |
0 | 2490 (39.4) |
1 | 1977 (31.3) |
2 | 1217 (19.3) |
>2 | 638 (10.1) |
Smoking behaviour | |
Smoking status | |
Never smoked | 5415 (85.8) |
Past | 426 (6.8) |
Current smoker | 469 (7.4) |
Among smokers, smoking intensity (# cigarettes/week) | |
1–5 | 343 (38.6) |
6–10 | 142 (16.0) |
11–20 | 202 (22.7) |
>20 | 201 (22.6) |
Among smokers, age at smoking initiation (years) | |
≤14 | 151 (16.9) |
15–18 | 486 (54.4) |
≥19 | 257 (28.7) |
BMI at enrolment | |
Underweight (<18.5 kg/m2) | 384 (6.1) |
Normal (18.5 to <25 kg/m2) | 3215 (50.9) |
Overweight (25 to <30 kg/m2) | 1604 (25.4) |
Obese (≥30 kg/m2) | 1118 (17.7) |
*Use of other contraceptive methods (diaphragm, sponge, spermicide, intrauterine device and others).
BMI, body mass index.