Table 2.

Bivariate and multivariate analysis of factors associated with the risk of breast cancer

Variables	Category	COR with 95% CI	AOR with 95% CI
Age	18–29 years	0.15 (0.60 − 0.35)**	0.05 (0.00-0.91)*
	30–49 years	0.89 (0.47–1.70)	2.09 (0.36–9.30)
	> 50 years	1	1
Residence	Urban	0.72 (0.43–1.21)*	1.33 (0.32–5.45)
	Rural	1	1
Marital status	Married	0.65 (0.40–1.18)
	Unmarried	1
Educational status	Illiterate	6.87 (3.10-15.27)**	1.10 (0.78–5.69)
	Primary	3.83 (1.56–9.40) **	8.58 (0.63–11.71)
	Secondary	4.10 (1.49–11.27)**	5.50 (0.39–7.78)
	College & above	1	1
Occupation	Housewife	3.73 (1.79–7.40)**	0.55 (0.06–5.27)
	Self employed	1.56 (0.78–3.14)*	0.65 (0.09–4.97)
	Government emp.	1	1
Monthly income	≤ 1000	5.54 (2.02–151.7)**	2.10 (0.24–8.35)
	1001–3000	1.98 (0.92–4.24)*	0.74 (0.12–4.70)
	3001–6000	1.73 (0.81–3.67)*	0.99 (0.22–4.49)
	> 6000	1	1
Dietary patterns	Healthy	0.74 (0.43–1.27)
	Unhealthy	1
Number of children ever born	0	4.6 (0.27–8.28	3.86 (0.33–9.88)
	1–3	1.15 (0.64–1.2.05)	1.04 (0.64–5.69)
	4 and above	1	1
Age at first Birth (n = 208)	14–18	2.60 (0.97–6.95)*	3.86 (0.33–4.48)
	19–24	1.50 (0.58–3.80)	5.70 (0.64–5.69)
	25 and above	1	1
Duration of breastfeeding (n = 208)	<=1year	9.16 (3.25–12.81)**	4.33 (2.78–6.89)*
	> 1 year	1	1
Physical exercise status	Sedentary	17.65 (5.87–3.06)**	10.53 (5.21–1.36)*
	lightly active	1.42 (0.75–2.71)	6.13 (1.042-6.00)*
	Moderate and highly active	1	1
Menopause status	pre-menopause	0.59 (0.34–1.02)*	0.53 (0.10-2.738)
	post-menopause	1	1
Chest radiation therapy	Yes	6.07 (2.81–13.08)**	6.43 (3.20–13.90)*
	No	1	1
Age of menarche	≤ 15years	3.68 (0.40–4.15)*	2.00 (0.76–5.32)
	> 15 years	1	1
Use modern of contraceptive	Yes	0.80 (0.45–1.42)
	No	1

Note: **: p < 0.05, *: p < 0.25 for bivariate analysis

*Boldface indicates statistically significant (P < 0.05) for multivariable analysis