Table 2.

Correlation coefficients for prior sexually transmissible infections among nested controls in the PLCO Cancer Screening Trial, 1993-2001

Infection	Race	Prevalence%	Correlation Coefficients1,2
			C. trachomatis (IgA)	C. trachomatis (IgG)	HPV-16	HPV-18	HSV-2	CMV	HHV-8	Syphilis (self-reported)
C. trachomatis (IgA)	Whites	5.1
	Blacks	12.8
C. trachomatis (IgG)	Whites	9.7	0.4***
	Blacks	35.7	0.2***
HPV-16	Whites	10.6	-0.02	0.05
	Blacks	47.5	0.1*	0.003
HPV-18	Whites	8.1	0.04	0.05	0.3***
	Blacks	43.2	-0.005	-0.05	0.4***
HSV-2	Whites	9.7	0.09*	0.1***	0.2***	0.1**
	Blacks	49.1	0.1	0.2*	0.06	-0.01
CMV	Whites	68.4	0.05	-0.01	0.1**	0.05	0.03
	Blacks	89.4	0.05	0.02	-0.008	0.01	0.1
HHV-8	Whites	11.3	-0.04	0.01	0.0009	-0.02	-0.04	0.04
	Blacks	6.0	-0.06	0.03	0.1	0.08	-0.04	0.01
Syphilis (self-reported)	Whites	0.6	0.2***	0.07	0.06	0.08	0.1**	0.03	0.01
	Blacks	5.7	0.06	-0.02	0.1	0.03	0.2*	0.04	0.2*
Gonorrhea (self-reported)	Whites	3.0	0.08*	0.03	0.1***	0.07	0.1**	-0.03	-0.04	0.2***
	Blacks	31.4	0.04	0.01	0.02	0.006	0.1*	0.002	0.09	0.3***

¹Values in regular font, whites; values in italic font, blacks

²* P_Chi-Square ≤0.01; ** P_Chi-Square ≤0.001; *** P_Chi-Square ≤0.0001