Table 3.

Frequencies of perinatal outcomes among all babies born to Aboriginal or Torres Strait Islander mothers by maternal smoking status

	NSW population 14	All births		Non-smoking		Smoking		Unadjusted	Adjusted*	PAF (%)
		n=18 154		Nns=9235		Ns=8919		RR (95% CI)	RR (95% CI)
	%	n	%	n	%	n	%
Preterm birth (<37 weeks)
Yes	8	2045	11	760	8.2	1285	14	0.59 (0.54 to 0.64)	0.58 (0.53 to 0.64)	26
Total		18 154	100	9235	100	8919	100
Small for gestational age (<3rd population percentile)
Yes	3	835	4.6	183	2.0	652	7.3	0.28 (0.23 to 0.32)	0.27 (0.23 to 0.32)	57
Total		18 132	100	9229	100	8903	100
Small for gestational age (<10th population percentile)
Yes	10	2381	13	641	7.0	1740	20	0.36 (0.33 to 0.39)	0.35 (0.32 to 0.39)	48
Total		18 132	100	9229	100	8903	100
Severe neonatal morbidity	Among live births only
Yes	5	1470	8.2	636	6.9	834	9.5	0.74 (0.67 to 0.81)	0.70 (0.63 to 0.77)	17
Total		17 978	100	9169	100	8809	100
Admission to SCN or NICU†
Yes	15	3957	22	1645	18	2312	26	0.70 (0.66 to 0.75)	0.66 (0.63 to 0.70)	20
Total		17 809	100	9059	100	8750	100
Perinatal death		Rate per 1000 total births
Yes	8	254	14	92	10‡	162	18‡	0.54 (0.42 to 0.70)	0.58 (0.44 to 0.76)	27
Stillborn	6	162		60	6.5‡	102	11‡	0.57 (0.41 to 0.78)	0.60 (0.43 to 0.84)	20
		Rate per 1000 live births
Neonatal death	2	92		32	3.5§	60	6.8§	0.50 (0.33 to 0.78)	0.54 (0.34 to 0.86)	30

*Adjusted for maternal age, any hypertension, any diabetes, parity and socioeconomic status (Socio-Economic Index for Areas (SEIFA)).

†Admission to Special Care Nursery (SCN) or Neonatal Intensive Care Unit (NICU) was restricted to those babies recorded as being born in a hospital of maternity service level 3 or higher or a private hospital.

‡Rate per 1000 total births.

§Rate per 1000 live births.

PAF, Population Attributable Fraction; RR, relative risk.