Table 4. Factors Associated With Total FACT-B Scores at 18 Months.

Factor	Univariate model		Multivariable modela
	Coefficient (95% CI)	P value	Coefficient (95% CI)	P value
Mastectomy
Without PMRT vs BCS	−3.1 (−8.7 to 2.5)	.28	−2.9 (−8.6 to 2.6)	.29
With PMRT vs BCS	−6.6 (−11.1 to −2.1)	.004	−5.5 (−10.1 to −0.9)	.02
Age (years)	0.1 (−0.1 to 0.3)	.15	0.1 (−0.06 to 0.3)	.17
Asian, Black, or American Indian or Alaska Native vs White	−7.3 (−13.2 to −1.3)	.02	−7.3 (−13.2 to −1.4)	.02
No college education vs college educationb	−0.71 (−4.9 to 3.4)	.74	NA	NA
ER/PR positive vs negative	−5.1 (−9.4 to −0.9)	.02	−4.4 (−8.8 to 0.07)	.05
Tumor size >2 cm vs ≤2 cm	−3.7 (−7.9 to 0.5)	.09	NA	NA
Nodal status positive vs negative	−3.3 (−7.9 to 1.3)	.15	NA	NA

Abbreviations: BCS, breast conserving surgery; ER, estrogen receptor; FACT-B, Functional Assessment of Cancer Therapy Scale–Breast Cancer; NA, not applicable; PR, progesterone receptor; PMRT, postmastectomy radiation.

^a Based on linear regression model with lowest Akaike information criterion.

^b Education status was missing or unknown for 30 patients and was not assessed in the multivariable model.