Table 2.

Demographic and sexual characteristic of study participants by study arm

	Study arm
	HPV-16/18 Vaccine		Control Vaccine
Age	n	%	n	%
18 years	634	17.0	653	17.5
19 years	558	15.0	591	15.8
20 years	516	13.8	490	13.1
21 years	431	11.6	415	11.1
22 years	417	11.2	448	12.0
23 years	400	10.7	397	10.6
24 years	395	10.6	384	10.3
25 years	375	10.1	358	9.6
Total	3,726	100.0	3,736	100.0
				p = 0.80
Years of education
< 7 years	1047	28.1	1068	28.7
7 – 9 years	868	23.3	828	22.2
10 + technical	1,178	31.6	1,240	33.3
University	632	17.0	591	15.9
Total	3,725	100.0	3,727	100.0
				p = 0.25
Marital status
Married	1,532	41.1	1,543	41.4
Divorce – widow	102	2.7	98	2.6
Single	2,091	56.1	2,088	56.0
Total	3,725	100.0	3,729	100.0
				p = 0.94
Age at first sexual intercourse (among sexually active)
18 +	961	32.6	946	32.5
17	553	18.7	561	19.3
16	483	16.4	503	17.3
15	525	17.8	503	17.3
14 years or less	430	14.6	397	13.6
Total	2,952	100.0	2,910	100.0
				p = 0.72
Number of lifetime sexual partners (among sexually active)
1	1,231	41.8	1,242	42.8
2	775	26.3	749	25.8
3	446	15.1	441	15.2
4	201	6.8	200	6.9
5	140	4.7	132	4.5
6 +	155	5.3	140	4.8
Total	2,948	100.0	2,904	100.0
				p = 0.95
Monthly frequency of sexual intercourse
1 or less	547	18.8	499	17.4
2 – 4	775	26.7	782	27.2
5 – 9	642	22.1	646	22.5
10 – 13	610	21.0	618	21.5
14 +	330	11.4	328	11.4
Total	2,904	100.0	2,873	100.0
				p = 0.71

Statistics for 4 women excluded for discordant vaccinations: Age - 19, 22, & 2 at 23; Education - <7 years, 2 at 7–9years, & University; Marital status - 2 married & 2 single; Age at first sex - 14 or less, 16, & 18+; Lifetime sex partners - 1, 3, & 4; Monthly frequency of sex - 1 or less & 2 at 5–9.

Unknowns excluded.