Table 4. The ORs for breast cancer prevalence by quartile of monthly household income.

	Model 1a	Model 2b	Model 3c
	OR(95%CI)	OR (95%CI)	OR(95%CI)
Monthly household income
medium-lowest/lowest	1.44 (0.92–2.24)	1.33 (0.85–2.09)	1.23 (0.78–1.95)
medium-highest/lowest	1.43 (0.86–2.36)	1.32 (0.77–2.25)	1.16 (0.67–2.02)
highest/lowest	1.67 (1.02–2.72)	1.49 (0.90–2.45)	1.25 (0.74–2.11)

^aAdjusted by age and survey year

^bAdjusted by Model 1 variables plus waist circumference, marital status, residential area, current smoking, alcohol intake in the past month, physical activity, cancer examination in the past 2 years, previous pregnancy, current or past use of oral contraceptives, post-menopausal status and age at menarche

^cAdjusted by Model 2 variables plus education level