Smoking Behaviour before, during, and after Pregnancy: The Effect of Breastfeeding

Table 1

Sample characteristics.

	Completed follow-up		Lost to follow-up
Variables	sample		sample		𝜒^2
	𝑁=2546		𝑁=988
	𝑁	Weighted %	𝑁	Weighted %	P
Age
<30	727	28.0	369	37.2	0.005
30–34	987	39.6	336	34.6
>35	832	32.4	283	28.2
Education
Low	743	27.4	337	34.4	<0.001
Medium	1267	48.8	467	46.2
High	536	23.8	184	19.4
Marital status
Married	2015	77.6	738	73.2	0.100
Single/Sep/Div/Wid	531	22.4	250	26.8
Employment
No	776	28.2	376	36.3	0.003
Yes	1770	71.8	612	63.7
Parity
Primiparous	1368	55.5	477	49.8	0.036
Multiparous	1144	44.5	483	50.2
Multiparous not breastfeeding previous birth or breastfeeding less than 3 months	387	35.4	174	39.5	0.268
Multiparous breastfeeding previous infant more than 3 months	754	64.6	304	60.5
Participation in antenatal classes
No	1535	59.3	727	76.3	<0.001
Yes	995	40.7	253	23.7
Smoking behaviour before pregnancy
No	1964	78.4	743	75.2	0.335
Yes	582	21.6	245	24.8
Quit during pregnancy	397	68.7	161	67.1	0.651
Smoking during pregnancy	183	31.3	84	33.0
Complete breastfeeding at discharge
No	669	29.6	310	32.5	0.188
Yes	1837	70.4	659	67.5