Table 3: Demographics at the time of birth of all Aboriginal or Torres Strait Islander mothers who gave birth to at least one singleton baby in NSW between 2010 and 2014 by method of reporting of Aboriginality.

*Socio-Economic Index for Areas – Index of Relative Socio-Economic Disadvantage (SEIFA IRSD). When ranking areas within NSW in order of their relative disadvantage, the lowest 20% (most disadvantaged) fall in the 1^st quintile and the highest 20% (least disadvantaged) fall in 5^th quintile.

^Chronic conditions encompasses renal, cardiac, thyroid, asthma, psychiatric, and other autoimmune conditions[22].

	Population 1	Population 2	Population 3	Population 4
	N=16,306	N=17,175	N=18,154	N=24,107
Maternal age	%	%	%	%
Under 20	18.0	18.1	17.7	15.6
20–24	33.5	33.3	33.1	30.6
25–29	25.1	25.2	25.4	25.9
30–34	14.8	14.8	15.0	17.0
35 and over	8.7	8.7	8.8	10.9
Parity	N=16,300	N=17,169	N=18,147	N=24,093
0	34.8	35.2	34.5	34.3
1	25.5	25.4	26.0	26.2
2	17.3	17.1	17.1	17.7
3+	22.4	22.2	22.4	21.8
SEIFA IRSD quintiles*	N=16,223	N=17,089	N=18,059	N=23,988
1st – most disadvantaged	27.1	26.8	26.7	25.7
2nd	20.5	20.4	20.3	19.7
3rd	29.8	29.8	29.8	28.5
4th	16.7	17.0	17.0	17.7
5th – least disadvantaged	5.8	6.0	6.2	8.4
Remoteness area	N=16,222	N=17,088	N=18,059	N=23,989
Major cities	22.5	22.8	23.2	27.2
Inner regional	33.9	33.8	34.0	34.0
Outer regional	34.0	34.1	33.8	31.3
Remote	6.1	5.9	5.7	4.9
Very remote	3.5	3.4	3.3	2.7
Smoked during pregnancy	N=16,306	N=17,175	N=18,154	N=24,107
Yes	49.7	49.3	49.1	44.2
Chronic conditions^	N=16,306	N=17,175	N=18,154	N=24,107
Yes	1.8	1.8	1.9	1.8
Any hypertension	N=16,306	N=17,175	N=18,154	N=24,107
Yes	9.4	9.3	9.3	9.3
Any diabetes	N=16,306	N=17,175	N=18,154	N=24,107
Yes	7.9	7.8	7.8	7.7