Table 3

Adjusted odds ratio for factors associated with non-registration, New South Wales, Australia, 2001–2005 (n = 398,730*)
Factors Values n Adjusted OR 95% CI
Indigenous status* Indigenous 12,626 3.26 3.10 3.43
Non-Indigenous 386,104 1
Maternal age* 25–39 311,542 1.00
<25 or >39 87,188 2.81 2.72 2.90
Birthweight (grams)* ≥2500g 375,296 1
<2500g 23,434 1.79 1.69 1.90
Plurality Single 385,990 1
Plural 12,740 0.84 0.76 0.92
Quarters*b First 103,861 1
Second 104,183 1.08 1.03 1.12
Third 108,516 1.30 1.24 1.35
Fourth 82,170 1.56 1.49 1.64
Number of previous pregnancies* 0 167,942 1
1 134,661 1.85 1.78 1.93
2 60,543 3.06 2.92 3.20
3 21,751 4.71 4.46 4.98
4+ 13,833 7.29 6.87 7.73
Remoteness* Major cities 300,897 1
Other areas 97,833 1.57 1.52 1.63
Mother’s country of birth* Australia 285,335 1
Other countries 113,395 0.72 0.69 0.75
Neonatal or postneonatal death No 397,663 1
Yes 1,067 3.84 3.23 4.57
Year of birth 2001 80,050 1
2002 82,985 8.96 7.98 10.06
2003 84,932 16.08 14.36 18.00
2004 84,039 17.39 15.54 19.47
2005 66,724 25.14 22.44 28.16

*Significantly different.

b The data from October to December 2005 were excluded because of the interval between birth and registration.

Xu et al.

Xu et al. BMC Pregnancy and Childbirth 2012 12:147   doi:10.1186/1471-2393-12-147

Open Data