Table 1.

Background of the participants.

	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%

^aSelf-reported.

^bBivalent or quadrivalent.