Table 1.

Characteristics for cases of any-grade squamous intraepithelial lesion (SIL) and frequency-matched controls.

	SIL Groups
	Cases (n = 93)		Controls (n = 172)		P 1
	N	%	N	%
Age (years)					0.48
≤ 20	13	14.0	24	14.0
21 – 30	42	45.2	66	38.4
31 – 40	22	23.7	56	32.6
> 40	16	17.2	26	15.1
Time in Study (yrs)	7.2	6.3, 8.2	7.2	6.5, 8.1	0.63
Number of study visits	14	13, 15	14	12, 15	0.02
HPV types					<.0001
Oncogenic	72	77.4	100	58.1
Non-oncogenic only	13	14.0	69	40.1
None	8	8.6	3	1.7
Ethnicity					0.64
White	54	58.1	105	61.0
Non-White	39	41.9	67	39.0
Marital Status					0.83
Common Law	33	35.5	61	35.5
Married	36	38.7	66	38.4
Single	15	16.1	33	19.2
Widowed/Divorced	9	9.7	12	7.0
Education					0.12
< Elementary	71	76.4	136	79.1
Elementary	20	21.5	32	18.6
≤ High School	2	2.2	4	2.3
Monthly Income, in US Dollars					0.29
< 250	33	35.5	41	23.8
250 – <450	20	21.5	47	27.3
451 – <725	20	21.5	39	22.7
≥ 725	19	20.4	38	22.1
Smoking status					0.87
Never	43	46.2	79	45.9
Former	13	14.0	28	16.3
Current	37	39.8	65	37.8
Oral contraceptive use					0.49
Never	19	20.4	28	16.3
< 6 years	51	54.8	107	62.2
≥ 6 years	23	24.7	37	21.5
Total no. of pregnancies					0.02
0 – 1	21	22.6	32	18.6
2 – 3	30	32.3	85	49.4
4 – 6	34	36.6	36	20.9
7+	8	8.6	17	9.9
Age at first intercourse					0.56
≤ 15	29	31.2	52	30.2
16 – 17	22	23.7	51	29.7
≥ 18	42	45.2	69	40.1
Lifetime no. of sexual partners					0.08
0 – 1	36	38.7	63	36.6
2 – 3	42	45.2	61	35.5
≥ 4	15	16.1	48	27.9
Total no. of sexual partners during the last year					0.11
0 – 1	86	92.5	147	85.5
≥ 2	6	6.5	22	12.8
Menarche					0.20
0-11	23	24.7	31	18.0
12-19	70	75.3	141	82.0
Condom use					0.02
No	85	91.4	168	97.7
Yes	8	8.6	4	2.3

¹P values determined using Pearson’s Chi-2 test or Kruskal Wallis test (time in study and number of study visits)