Table 3. Associations between antenatal depressive symptoms and postnatal depressive symptoms, perinatal outcomes, and breast feeding behaviours of mothers of infants from South Western Sydney and Sydney Local Health Districts in 2014 (n = 17,564).

				Complete case				Multiple imputation
Outcome	n	N	%	Unadjusted OR (95%CI) (a)	P value	Adjusted OR (95%CI) (b)	P value	Unadjusted OR (95%CI) (a)	P value	Adjusted OR (95%CI) (b)	P value
Postnatal depressive symptoms
Antenatal depressive symptoms
No	181	7,871	2.3	1.0		1.0		1.0		1.0
Yes	72	496	14.5	7.2 (5.4–9.6)	<0.001	6.4 (4.8–8.7)	<0.001	7.3 (5.7–9.5)	<0.001	6.6 (5.1–8.7)	<0.001
Low birth weight (<2500g)
Antenatal depressive symptoms
No	402	10,574	3.8	1.0		1.0		1.0		1.0
Yes	43	663	6.5	1.8 (1.3–2.4)	0.001	1.7 (1.2–2.3)	0.003	1.6 (1.2–2.2)	0.004	1.5 (1.1–2.1)	0.013
Gestational age (<37 weeks)
Antenatal depressive symptoms
No	1,129	10,542	10.7	1.0		1.0		1.0		1.0
Yes	95	663	14.3	1.4 (1.1–1.8)	0.004	1.3 (1.1–1.7)	0.018	1.5 (1.2–1.8)	<0.001	1.3 (1.1–1.6)	0.004
Non-exclusive breastfeeding at delivery
Antenatal depressive symptoms
No	941	9,025	10.4	1.0		1.0		1.0		1.0
Yes	66	520	12.7	1.3 (0.9–1.6)	0.103	1.1 (0.8–1.5)	0.454	1.3 (1.0–1.7)	0.031	1.1 (0.9–1.4)	0.371
Non-exclusive breastfeeding at discharge
Antenatal depressive symptoms
No	1,146	10,120	11.3	1.0		1.0		1.0		1.0
Yes	82	619	13.2	1.2 (0.9–1.5)	0.145	1.2 (0.9–1.5)	0.167	1.4 (1.1–1.8)	0.002	1.4 (1.1–1.7)	0.010
Non-exclusive breastfeeding at first post-natal visit.
Antenatal depressive symptoms
No	1,399	8,690	16.1	1.0		1.0		1.0		1.0
Yes	104	537	19.4	1.3 (1.0–1.6)	0.047	1.3 (1.1–1.7)	0.015	1.3 (1.1–1.6)	0.017	1.3 (1.0–1.6)	0.021

(a): Unadjusted Odds Ratio (OR)

(b): Adjusted for maternal age, socio-economic status, Indigenous status, history of intimate partner violence, language spoken at home, body mass index and history of antenatal problems (such as diabetes mellitus and hypertension).