Table 2.

Maternal and neonatal characteristics associated with breast milk feeding continuation until 6 months among all ever‐breastfed infants and among infants still breastfeeding at discharge

	Model 1 all ever‐breastfed infants		Model 2 infants breastfed at discharge
	Adjusted RR	95% CI	Adjusted RR	95% CI
Maternal age (years)
<25	0.68	0.53–0.88	0.92	0.77.–1.09
25–34	1.00	Ref.	1.00	Ref.
≥35	1.11	0.94–1.30	1.13	0.97–1.32
Mother born outside of Europe	1.47	1.26–1.71	1.44	1.29–1.62
Mother's educational level
Lower secondary	0.58	0.45–0.76	0.65	0.49–0.85
Upper secondary	0.67	0.55–0.82	0.74	0.62–0.87
Bachelor degree or less	0.85	0.70–1.02	0.86	0.74–0.99
Master/doctoral degree	1.00	Ref.	1.00	Ref.
Parity
0	1.00	Ref.	1.00	Ref.
1	0.97	0.86–1.10	0.91	0.82–1.01
2 or more	0.83	0.64–1.07	0.99	0.81–1.20
Type of pregnancy (multiple)	0.69	0.58–0.81	0.80	0.70–0.91
Gestational age (weeks)
23–25	1.06	0.86–1.32	1.31	1.07–1.60
26–27	1.20	1.02–1.41	1.29	1.11–1.50
28–29	0.99	0.88–1.11	1.06	0.92–1.22
30–31	1.00	Ref.	1.00	Ref.
SGA (<10th percentile)	1.04	0.97–1.12	1.10	1.01–1.18
Severe neonatal morbiditya	0.95	0.76–1.18	0.93	0.72–1.19
Bronchopulmonary dysplasiab	0.83	0.73‐0.94	0.97	0.84–1.12
Surgeryc	1.21	1.05‐1.41	1.17	0.97–1.42
Transfers during neonatal care
0	1.00	Ref.	1.00	Ref.
1	0.92	0.78–1.09	0.89	0.79–1.00
2 or more	0.83	0.67–1.03	0.84	0.72–0.99
Breastfeeding at discharge
Exclusive feeding at breast	‐	‐	1.00	Ref.
Exclusive feeding not at breast	‐	‐	0.86	0.71–1.05
Mixed feeding at breast	‐	‐	0.60	0.48–0.74
Mixed feeding not at breast	‐	‐	0.46	0.31–0.69

Note. aRR: adjusted risk ratio for all variables in the table; Ref.: reference.

^aIncluded retinopathy of prematurity, intraventricular haemorrhage, periventricular leukomalacia and necrotizing enterocolitis.

^bOxygen dependence or ventilation at 36 weeks of gestational age.

^cDuring neonatal hospitalization.