Table 3.

Results of univariable and multivariable logistic regression analyses.

Variable	Category	Odds Ratio (95% CI)
		Univariable Analysis	Multivariable Analysis
			Model with additive effects only	Model with Additive and interaction effects
Additive effects
Race/ethnicity	SA	1.25 (1.18, 1.33)	1.03 (0.97, 1.10)	1.33 (1.19, 1.48)
	NHW	1.0	1.0	1.0
Age	<40 years	2.56 (2.49, 2.64)	2.34 (2.27, 2.41)	2.36 (2.28, 2.43)
	40–49 years	1.55 (1.52, 1.57)	1.53 (1.51, 1.56)	1.54 (1.51, 1.57)
	≥ 50 years	1.0	1.0	1.0
Stage	Regional or distant	2.51 (2.48, 2.54)	2.39 (2.35, 2.42)	2.39 (2.36, 2.42)
	Localized	1.0	1.0	1.0
Grade	III or IV	1.66 (1.64, 1.68)	1.28 (1.26, 1.30)	1.28 (1.26, 1.30)
	I or II	1.0	1.0	1.0
ER status	Negative	1.49 (1.47, 1.51)	1.07 (1.05, 1.10)	1.07 (1.05, 1.10)
	Positive	1.0	1.0	1.0
PR status	Negative	1.39 (1.37, 1.41)	1.15 (1.12, 1.17)	1.15 (1.12, 1.17)
	Positive	1.0	1.0	1.0
Interaction effects
Race/ethnicity * Age	SA * Age < 40 years	-	-	0.70 (0.58, 0.85)
	SA * Age 40–49 years	-	-	0.72 (0.62, 0.83)
Rage * Stage	SA * regional or distant	-	-	0.84 (0.74, 0.95)
Race * Grade	SA * Grade III or IV	-	-	0.94 (0.82, 1.08)
Race * ER	SA * ER negative	-	-	0.96 (0.77, 1.19)
Race * PR	SA * PR negative	-	-	0.99 (0.82, 1.21)
AIC			521985.5	521955.6
BIC			522073	522108.7
AUC			0.6524	0.6524