Table 5.

Multivariable logistic regression for association between individual demographic characteristics and breast cancer stage at diagnosis (stage 0 & I, stage II, III & IV), stratified by area-based SES*

Variable	High SES areas		Low SES areas
	OR (95%CI)	Wald (P)	OR (95%CI)	Wald (P)
Age at Diagnosis (Years)
≤ 40	1.00		1.00
40-69	0.94 (0.29-3.09)	0.01 (0.92)	1.18 (0.43-3.23)	0.10 (0.75)
≥ 70	1.02 (0.70-1.51)	0.02 (0.90)	1.40 (0.85-2.29)	1.75 (0.19)
Body Mass Index (kg/m2)
≤ 24.99	1.00		1.00
≥ 25.00	1.37 (0.92-2.06)	2.39 (0.12)	1.09 (0.40-12.97)	0.03 (0.86)
Occupation
Homemaker	1.00		1.00
Manual worker	0.81 (0.33-2.02)	0.20 (0.65)	0.18 (0.05-0.64)	6.99 (0.01)
White-collar worker	0.77 (0.33-1.80)	0.37 (0.54)	0.26 (0.08-0.88)	4.66 (0.03)
Other	1.21 (0.45-3.25)	0.14 (0.70)	0.18 (0.05-0.65)	6.85 (0.01)
Education
University and above	1.00		1.00
High school	2.89 (1.30-6.44)	6.76 (0.01)	0.42 (0.07-2.36)	0.97 (0.32)
Middle school	2.77 (132-5.79)	7.27 (0.01)	0.97 (0.42-2.21)	0.01 (0.94)
Primary school	1.87 (0.99-3.64)	3.43 (0.06)	0.98 (0.47-2.05)	0.01 (0.96)
None	1.64 (0.87-3.08)	2.34 (0.13)	0.74 (0.40-1.36)	0.93 (0.34)
Marital Status
Married	1.00		1.00
Single	6.27 (0.81-48.76)	3.08 (0.08)	1.01 (0.11-9.51)	0.001 (0.99)
Widowed/Divorced	1.18 (0.14-10.06)	0.02 (0.88)	0.49 (0.15-1.62)	1.38 (0.24)
ER/PR status
ER+&PR+	1.00		1.00
ER+&PR-	0.97 (0.50-1.90)	0.01 (0.93)	1.10 (0.54-2.23)	0.07 (0.79)
ER-&PR+	1.57 (0.83-2.95)	1.96 (0.16)	0.73 (0.36-1.51)	0.70 (0.40)
ER-&PR-	1.04 (0.69-1.56)	0.04 (0.85)	1.31 (0.81-2.11)	1.19 (0.28)

*: Education information for 50.3% of cases in the highest SES area was unknown, so we did not analyze the effect of individual demographic characteristics in this subgroup