Table 1. Selected baseline characteristics of the ALTS population in the present analysis.

	Smoking
	Never (n = 1,095)		Former (n = 244)		Current (n = 637)
	n	%	n	%	n	%
HPV-16 infection during follow-up
positive	73	7.0	13	5.7	45	7.9
negative	967	93.0	217	94.3	526	92.1
HPV-16 antibodies
positive	281	25.7	53	21.7	124	19.5
negative	814	74.3	191	78.3	513	80.5
Age (mean, sd)	28.9	(9.6)	35	(12.0)	27.5	(8.4)
Race/Ethnicity
White	546	50.0	198	81.1	439	69.4
Black	449	41.1	29	11.9	139	22.0
Other	98	8.9	17	7.0	55	8.6
Education
< HS	130	11.9	22	9.0	168	26.4
Completed HS	339	31.0	69	28.3	195	30.7
Some College+	626	57.2	153	62.7	273	42.9
Lifetime number of sex partners
1-2	287	26.4	40	16.5	54	8.5
3-4	271	25.0	46	19.0	112	17.7
5-6	227	20.9	54	22.3	131	20.7
7+	301	27.7	102	42.1	336	53.1
Age sexual debut
<16	283	25.9	74	30.3	300	47.2
16-17	388	35.5	81	33.2	233	36.6
18-19	251	23.0	60	24.6	78	12.3
20+	170	15.6	29	11.9	25	3.9
History of an STI
Yes	459	41.9	83	34.0	300	47.1
No	636	58.1	161	66.0	337	52.9

^*numbers not adding to total are due to missing data

Abbreviations: ALTS = Atypical Squamous Cells of Undetermined Significance/Low-Grade Squamous Intraepithelial Lesion Triage Study; HPV = human papillomavirus, HS = high school; sd = standard deviation; STI = sexually transmitted infection