Table 6.

Potential Mediation of Racial/Ethnic Disparities Among Women Diagnosed with ER/PR-Negative Breast Cancer, Breast Cancer Care in Chicago Study, 2005–2008

Characteristic	No. of Women	Average Controlled Direct Associations			Rescaled Coefficients
		RDa	95% CIb	% Reductionc	% Reductiond	P Valuee
Minority Women Versus Non-Hispanic White Women
Age (baseline model)	746	0.133	0.081, 0.191
Modeled separately
SEP	746	0.072	−0.020, 0.145	46
RPF	746	0.091	0.032, 0.161	32
Modeled together	746	0.053	−0.039, 0.125	60	61	0.002
SEP					35
RPF					26
Non-Hispanic Black Women Versus Non-Hispanic White Women
Age (baseline model)	603	0.163	0.100, 0.225
Modeled separately
SEP	603	0.102	0.008, 0.193	37
RPF	603	0.122	0.050, 0.193	25
Modeled together	603	0.087	−0.010, 0.189	47	46	0.002
SEP					26
RPF					20
Hispanic Women Versus Non-Hispanic White Women
Age (baseline model)	443	0.075	−0.004, 0.150
Modeled separately
SEP	443	0.001	−0.091, 0.097	99
RPF	443	0.040	−0.030, 0.112	47
Modeled together	443	−0.013	−0.095, 0.091	117	119	0.007
SEP					82
RPF					36

Abbreviations: CI, confidence interval; ER, estrogen receptor; PR, progesterone receptor; RD, risk difference; RPF, reproductive factors; SEP, socioeconomic position.

^a RD calculated using logistic regression with marginal standardization.

^b 95% CI calculated using bias-corrected bootstrap methods.

^c Percent reduction in the risk difference when compared with the baseline model.

^d Percent reduction based on the method of rescaled coefficients.

^e P value from a test of the difference in coefficients between the reduced model (without the mediators) and the full model (which included the mediators).