Table 2.

Defining the interactions among high risk groups for smoking in pregnancy in NSW

	Percentage of smoking during pregnancy (SIP)
	Maternal age (years)			Aboriginal status		Weeks of gestation at 1st antenatal visit
	<20 years	20–34	35+	Aboriginal	Non-Aboriginal	0–12	13–26	27+
Maternal age (years)
<20 years	-	-	-	60.5	40.5	43.0	41.6	44.7
20–34	-	-	-	56.7	15.9	14.3	18.3	31.4
35+	-	-	-	60.2	10.7	9.4	12.7	24.6
Aboriginal status
Aboriginal	60.5	56.7	60.2	-	-	51.3	58.2	72.5
Non-Aboriginal	40.5	15.9	10.7	-	-	13.6	17.6	28.7
Socio-economic status (SES)
Lowest SES	42.8	21.5	17.4	59.8	20.7	20.1	22.1	34.4
Moderate SES	43.7	16.6	11.5	55.1	16.0	14.5	18.8	32.1
Highest SES	36.3	6.9	4.8	36.5	6.5	5.0	9.1	16.3
Country of birth
English speaking background	45.7	19.8	13.5	-	-	16.1	23.9	45.0
Non-English speaking background	10.3	4.9	4.8	-	-	3.8	5.2	9.4
Weeks of gestation at 1st antenatal visit
0–12 weeks	43.0	14.3	9.4	51.3	13.6	-	-	-
13–26 weeks	41.6	18.3	12.7	58.2	17.6	-	-	-
27 weeks +	44.7	31.4	24.6	72.5	28.7	-	-	-