Risk Factors for Chronic Mastitis in Morocco and Egypt

Table 5

Conditional logistic regression for predictors of chronic mastitis. Model 1: adjusted only for age and study site and Model 2: adjusted for all significant variables, interactions (𝑛=197).

Predictors	Model 1		Model 2
	OR	95% CI	OR	95% CI
Employment
Housekeeper/unemployed	1.00	ref	1.00	ref
Other	0.53*	(0.46, 0.61)	0.71*	(0.60, 0.84)
Mice
No mice reported	1.00	ref	1.00	ref
Mice in neighborhood	0.97	(0.80, 1.16)	0.91	(0.73, 1.13)
Campaign to control mice in neighborhood	1.60*	(1.36, 1.87)	1.47*	(1.10, 1.98)
Control mice in household	1.19	(0.92, 1.52)	1.63*	(1.36, 1.97)
Parity	1.62*	(1.54, 1.70)	1.75*	(1.62, 1.90)
Age at first birth	0.99	(0.98, 1.01)	—	—
History of contraception
No	1.00	ref	1.00	ref
Yes	2.80*	(2.42, 3.24)	2.73*	(2.07, 3.61)
Menopausal status
Pre-	1.00	ref	1.00	ref
Post-	0.66*	(0.54, 0.81)	0.62*	(0.49, 0.79)
Age at menopause	1.02	(0.99, 1.05)	—	—
Breastfed all children
No	1.00	ref	1.00	ref
Yes	3.04*	(2.64, 3.50)	3.76*	(2.69, 5.25)
Breastfed at least one child
No	1.00	ref	—	—
Yes	4.89*	(4.11, 5.81)	—	—
Breastfed with both breasts
Yes	1.00	ref	1.00	ref
No	2.75*	(2.32, 3.27)	4.40*	(3.39, 5.72)
Did not breastfeed	0.30*	(0.25, 0.36)	1.54*	(1.07, 2.21)
Wears a bra
No	1.00	ref	1.00	ref
Yes	0.68*	(0.58, 0.79)	0.56*	(0.47, 0.67)
Proximity to pregnancy/lactation
No proximity	1.00	ref	1.00	ref
Problem during pregnancy, lactation, or within 6 months after lactation	1.20*	(1.04, 1.38)	1.67*	(1.32, 2.11)
Parity* contraception	—	—	0.86	(0.80, 0.93)
Parity* breastfed all	—	—	0.80	(0.73, 0.87)
Lactation problem*breastfed with both breasts
Did not use both breasts	—	—	0.32	(0.22, 0.46)
Did not breastfeed	—	—	0.46	(0.31, 0.68)

∗Significant at 𝛼≤0.05.