Table 1.

Demographic characteristics and variables included in the logistic regression analysis of SV40 seropositivity among women in Houston, Texas

Characteristics	Total subjects (%)	No. SV40 antibody-negative	No. SV40 antibody-positive (%)	Logistic regression P-value
Cohort A (1970s)
Age, mean (± sd [range]), years	19 (± 3.5 [13–34])	19 (± 3.5 [13–34])	18 (± 3.1 [13–25])
Year of Birth				NA
Before 1963	212	197	15 (7%)
1963 or later	0	0	0
Race/Ethnicity				0.17
African-American	145 (68%)	132	13 (9%)
Caucasian	67 (32%)	65	2 (3%)
Pregnant at enrollmenta				0.74
Yes	150 (72%)	140	10 (7%)
No	57 (28%)	52	5 (9%)
No. previous pregnanciesa				0.81
0	22 (11%)	20	2 (9%)
1	167 (81%)	156	11 (7%)
≥2	18 (9%)	16	2 (11%)
History of STDa				0.96
Yes	24 (12%)	22	2 (8%)
No	183 (88%)	170	13 (7%)
Cohort B (1970s)
Age, mean (± sd [range]), years	18 (± 2.3 [13–24])	18 (± 2.4 [13–24])	18 (± 2.0 [13–24])
Year of Birth				NA
Before 1963	211	174	37 (18%)
1963 or later	0	0	0
Race/Ethnicity				NA
African-American	0 (0%)	0	0
Caucasian	211 (100%)	174	37 (18%)
Pregnant at enrollment				NA
Yes	0 (0%)	0	0
No	211 (100%)	174	37 (18%)
Cohort C (1990s)
Age, mean (± sd [range]), years	28 (± 10.1 [15–75])	28 (± 10.0 [15–75])	30 (± 11.1 [16–65])	0.43
Year of Birth				0.76
Before 1963	144 (36%)	129	15 (10%)
1963 or later	256 (64%)	232	24 (9%)
Race/Ethnicity				0.01
African-American	199 (50%)	188	11 (6%)
Caucasian	100 (25%)	95	5 (5%)
Hispanic	101 (25%)	78	23 (23%)
Pregnant at enrollment				NA
Yes	0 (0%)	NA	NA
No	400 (100%)	NA	NA
No. previous pregnanciesa				0.70
0	83 (22%)	79	4 (5%)
1	90 (24%)	84	6 (7%)
≥2	200 (54%)	166	34 (17%)
History of STDa				0.65
Yes	167 (45%)	158	9 (5%)
No	204 (55%)	180	24 (12%)

NA, not applicable; sd, standard deviation; STD, sexually transmitted disease.

^aInformation not available for all subjects.