Table 2.

Univariate analyses* of factors associated with type of surgery

				Mastectomy (vs. BCS) N = 1,893
				%	OR (95% CI)
Predisposing factors at the time of initial decision making
Age at diagnosis,
<65				64.9	1(referent)
≥65				71.0	1.70(1.32-2.19)
Educational level
high school or less				67.2	1(referent)
college or higher				61.6	0.80(0.72-0.90)
Marital status
no spouse				66.2	1(referent)
married				65.2	0.93(0.81-1.08)
Having a religion
no				65.8	1(referent)
yes				65.2	0.99(0.86-1.14)
Monthly income
<US$3000				68.6	1(referent)
≥US$3000				61.8	0.69(0.63-0.77)
Residential area
rural				70.2	1(referent)
metropolitan area				64.7	0.78(0.65-0.94)
Number of adults living together
<3				65.6	1(referent)
≥3				64.5	0.96(0.85-1.07)
Employment status
unemployed				64.6	1(referent)
employed				65.2	1.07(0.96-1.19)
Comorbidities
none				63.6	1(referent)
≥1				66.8	1.17(1.05-1.29)
Menopausal status
premenopausal				63.5	1(referent)
postmenopausal				68.0	1.17(1.04-1.30)
Estrogen receptor
negative				65.8	1(referent)
positive				62.9	0.88(0.80-0.98)
Progesterone receptor
negative				65.1	1(referent)
positive				65.5	1.00(0.90-1.11)
Stage
0-IIa				61.5	1(referent)
IIb				84.3	3.68(3.11-4.35)
Shared decision making factors
Being patient's opinion respected in surgical treatment decision
no				62.7	1(referent)
yes				73.3	1.48(1.24-1.76)
Physician's giving information
Breast surgery option
no				74.5	1(referent)
yes				63.7	0.59(0.49-0.71)
Using radiotherapy (ref. no)
no				67.1	1(referent)
yes				65.9	0.95(0.82-1.09)
Using chemotherapy (ref. no)
no				44.0	1(referent)
yes				72.0	3.17(2.79-3.59)
Using hormone therapy (ref. no)
no				49.1	1(referent)
yes				73.4	2.41(2.15-2.69)

Abbreviation: BCS, breast-conserving surgery; CI, confidence interval

* All analyses weighted to account for differential selection by clinical factors of non-response.