Table 1

Characteristics of the study population by any adult abuse in the Norwegian Mother and Child Cohort Study (N=53 934)

	Total		Any adult abuse		p Value*
	n	Per cent	n	Per cent	p Value*
All	53 934	100	10 442	19.4
BF initiation
No	618	1.1	147	23.8	0.005
Yes	53 316	98.9	10 295	19.3
Full BF for 4 months
No	20 991	38.9	4510	21.5	<0.001
Yes	32 325	59.9	5785	17.9
No BF initiation	618
Full BF for 6 months
No	45 802	84.9	8896	19.4	0.102
Yes	7514	13.9	1399	18.6
No BF initiation	618
Any BF for 4 months
No	6539	12.1	1588	24.3	<0.001
Yes	46 777	86.7	8707	18.6
No BF initiation			147
Any BF for 6 months
No	10 341	19.2	2445	23.6	<0.001
Yes	42 945	79.7	7850	18.3
No BF initiation	618		147
Age (years)
14–19	693	1.3	101	14.6	<0.001
20–24	6423	11.9	1162	18.1
25–29	19 628	36.4	3383	17.2
30–34	21 945	40.7	4390	20.0
≥35	5245	9.7	1406	26.8
Education
Primary (9 years)	1195	2.2	332	27.8	<0.001
Secondary (12 years)	15 902	29.5	3556	22.4
Higher ≤4 years	31 432	58.3	5218	16.6
Higher >4 years	3544	6.6	910	25.7
Missing information	1861	3.5	426	22.9
Civil status
Married	26 572	49.3	4504	17.0	<0.001
Cohabiting	25 543	47.4	5289	20.7
Not married/cohabiting	1523	2.8	578	38.0
Missing information	296	0.5	71	24.0
Child abuse
No	44 064	81.7	7209	16.4	<0.001
Yes	9870	18.3	3233	32.8
Parity
0	27 666	51.3	5155	18.6	<0.001
+1	26 268	48.7	5287	20.1
Mode of delivery
Vaginal	50 296	93.3	9627	19.1	<0.001
C-section	3638	6.7	815	22.4
Preterm delivery
No (≥37 weeks)	51 258	95.0	9874	19.3	0.026
Yes (<37 weeks)	2472	4.6	521	21.1
Missing information	204	0.4	47	23.0
Smoking in pregnancy
No	49 100	91.0	8954	18.2	<0.001
Yes	4834	9.0	1488	30.8
Alcohol in pregnancy
Never	38 931	72.2	7494	18.8	<0.001
Sometimes	7221	13.4	1628	22.5
Daily	47	0.1	19	40.4
Missing information	6705	12.4	1301	19.4
BMI
<25	35 389	66.5	6700	18.7	<0.001
≥25	16 552	30.7	3422	20.7
Missing information	1490	2.8	320	21.5
Postpartum depression
No	47 349	87.8	8370	17.7	<0.001
Yes	5716	10.6	1897	33.2
Missing information	869	1.6	175	20.1

*p Value calculated using Pearson's χ² test (missing category not included).
BF, breast feeding; BMI, body mass index.