Table 1.

Demographic and exposure characteristics of cases and controls

	A. White cases (n=75)	B. White controls (n=65)	P value A vs. B	C. Black controls (n=84)	P value B vs C	P value A vs C
Age (mean±S.D.)	34.1±9.6	39.0±12.0	0.011	37.0±11.7	0.295	0.095
Married or living as married	79.5% (N=59)	60.9 %(N=39)	0.009	13.1% (N=11)	<0.001	<0.001
Never married	17.8% (N=13)	18.8% (N=12)		57.1% (N=48)
Widowed	0.0% (N=0)	1.6% (N=1)		3.6% (N=3)
Separated or divorced	2.7% (N=2)	18.8% (N=12)		26.2% (N=22)
Missing	(N=1)	(N=1)		(N=0)
Education (mean±S.D. in years)	15.2±2.5	14.6±2.5	0.132	12.9±1.7	<0.001	<0.001
Missing	(N=3)	(N=2)		(N=0)
Household income
<$20,000	2.7% (2)	14.5% (9)	0.007	58.5% (48)	<0.001	<0.001
$20,001-$40,000	17.8% (13)	32.3% (20)		24.4% (20)
$40,001-$60,000	28.8% (21)	19.4% (12)		8.5% (7)
>$60,000	50.7% (37)	33.9% (21)		8.5% (7)
Missing	(N=2)	(N=3)		(N=2)
Intercourse over past month	64.9% (48)	66.2% (43)	0.873	54.3% (44)	0.608	0.183
Missing	(N=1)	(N=1)		(N=3)