Table 1 Background of the participants.
From: Risk factors for HPV infection and high-grade cervical disease in sexually active Japanese women
All | Group A (20–30 yrs) | Group B (35–36 yrs) | Group C (40–41 yrs) | |||||
|---|---|---|---|---|---|---|---|---|
Birth year: 1984–1995 | Birth year: 1978–1980 | Birth year: 1973–1975 | ||||||
(n = 3231) | (n = 2179) | (n = 725) | (n = 327) | |||||
n | % | n | % | n | % | n | % | |
Age | ||||||||
Mean(± SD) | 29.8 | (± 5.7) | 26.3 | (± 2.9) | 35.5 | (± 0.5) | 40.3 | (± 0.5) |
Age at first intercourse (yrs) | ||||||||
≤ 14 | 109 | 3.4% | 91 | 4.2% | 16 | 2.2% | 2 | 0.6% |
15–16 | 779 | 24.1% | 638 | 29.3% | 114 | 15.7% | 27 | 8.3% |
17–19 | 1441 | 44.6% | 907 | 41.6% | 361 | 49.8% | 173 | 52.9% |
≥ 20 | 902 | 27.9% | 543 | 24.9% | 234 | 32.3% | 125 | 38.2% |
Mean(± SD) | 18.4 | (± 2.8) | 18.0 | (± 2.7) | 18.8 | (± 2.9) | 19.6 | (± 3.3) |
Number of lifetime sexual partners | ||||||||
1 | 526 | 16.3% | 400 | 18.4% | 77 | 10.6% | 49 | 15.0% |
2–5 | 1670 | 51.7% | 1097 | 50.3% | 383 | 52.8% | 190 | 58.1% |
6–9 | 580 | 18.0% | 372 | 17.1% | 148 | 20.4% | 60 | 18.3% |
≥ 10 | 455 | 14.1% | 310 | 14.2% | 117 | 16.1% | 28 | 8.6% |
Smoking history | ||||||||
Never | 2290 | 70.9% | 1592 | 73.1% | 477 | 65.8% | 221 | 67.6% |
Former | 475 | 14.7% | 271 | 12.5% | 141 | 19.6% | 63 | 19.4% |
Current | 444 | 13.7% | 302 | 13.9% | 101 | 13.9% | 41 | 12.5% |
Missing | 52 | 1.6% | 32 | 1.5% | 17 | 2.3% | 3 | 0.9% |
HPV vaccinationa | ||||||||
Vaccinatedb | 112 | 3.5% | 94 | 4.3% | 15 | 2.1% | 3 | 0.9% |
Unvaccinated | 3116 | 96.4% | 2083 | 95.6% | 709 | 97.8% | 324 | 99.1% |
Missing | 3 | 0.1% | 2 | 0.1% | 1 | 0.1% | 0 | 0.0% |
