Table 1.

Variable definition and measurement used in the analysis.

Variable name	Definition and measurement
VR-6D index	A single utility index generated from VR-12
Radiation therapy	1 if the patient received radiation therapy after BCS,   otherwise 0
Race	0 if the patient was white
	1 if the patient was black
	2 if the patient was not white nor black (others)
Marital status	0 if the patient was unmarried (single, divorced,   and widowed)
	1 if the patient was married
Age at diagnosis	0 if the patient age was 65–69 years
	1 if the patient age was 70–74 years
	2 if the patient age was 75–79 years
	3 if the patient age was 80 years or older
Tumor grade	0 if the tumor was well differentiated
	1 if the tumor was moderately differentiated
	2 if the tumor was poorly differentiated or   undifferentiated
Education	0 if the patient was high-school graduate or less   (≤high school)
	1 if the patient had some college degree or 2 years   degree
	2 if the patient was college graduate or higher
Comorbidity	0 if the patient had no comorbidity
	1 if the patient had 1–2 comorbidities
	2 if the patient had >2 comorbidities
Proxy	If the survey was completed by a third party, i.e.   not self-reported
	0 if the survey was completed by the patient herself
	1 if the survey was completed by a third party
Time from cancer   diagnosis to survey	0 if time from cancer diagnosis was ≥0 months but   <7 months
	1 if time from cancer diagnosis was ≥7 months but   <12 months
	2 if time from cancer diagnosis was ≥13 months   but <19 months
Time from diagnosis   to treatment	0 if time from diagnosis to treatment <2 months
	1 if time from diagnosis to treatment is ≥2 months
Area of residence	0 if the women reside in non-metro area at the   time diagnosis
	1 if the women reside in metro area at the time of   diagnosis
Year of diagnosis	The year the patient diagnosis breast cancer