|  | Antepartum still births (ante=1) | Births | Univariable hazard ratio | 95% confidence interval | Multivariable hazard ratio | 95% confidence interval |
---|---|---|---|---|---|---|---|
Indigenous | Â | Â | Â | Â | Â | Â | Â |
 | Aboriginal or Torres Strait Islander | 35 | 8121 | 1.31 | 0.94, 1.84 | 1.09 | 0.77, 1.55 |
 | Not ATSI | 1092 | 319569 |  |  |  |  |
Maternal age (years) | Â | Â | Â | Â | Â | Â | Â |
 | < 20 | 66 | 15221 | 1.31 | 0.98, 1.74 | 1.18 | 0.88, 1.57 |
 | 20 -24 | 161 | 48302 | Referent | Referent |  |  |
 | 25-29 | 304 | 92003 | 1.00 | 0.83, 1.21 | 1.14 | 0.94, 1.34 |
 | 30-34 | 343 | 107730 | 0.98 | 0.81, 1.18 | 1.21 | 1.00, 1.47 |
 | 35-39 | 184 | 52748 | 1.09 | 0.88, 1.35 | 1.40 | 1.12, 1.75 |
 | ≥ 40 | 69 | 11686 | 1.90 | 1.43, 2.52 | 2.41 | 1.80, 3.23 |
Parity | Â | Â | Â | Â | Â | Â | Â |
 | Multiparous | 502 | 154473 | Referent |  |  |  |
 | Nulliparous | 625 | 173217 | 1.07 | 0.96, 1.21 | 1.23 | 1.08, 1.40 |
Preexisting diabetes | Â | Â | Â | Â | Â | Â | Â |
 | No | 1110 | 325801 | Referent |  |  |  |
 | Yes | 17 | 1889 | 3.11 | 1.93, 5.03 | 2.65 | 1.63, 4.32 |
Preexisting hypertension | Â | Â | Â | Â | Â | Â | Â |
 | No | 1095 | 324194 | Referent |  |  |  |
 | Yes | 32 | 3496 | 3.03 | 2.13, 4.31 | 2.77 | 1.94, 3.97 |
Smoking during pregnancy | Â | Â | Â | Â | Â | Â | Â |
 | No | 877 | 279191 | Referent |  |  |  |
 | Yes | 250 | 48499 | 1.68 | 1.46, 1.93 | 1.82 | 1.56, 2.12 |
Baby gender | Â | Â | Â | Â | Â | Â | Â |
 | Female | 547 | 158448 | Referent |  |  |  |
 | Male | 580 | 169242 | 1.00 | 0.89, 1.12 | 1.00 | 0.89, 1.12 |
Gestational diabetes | Â | Â | Â | Â | Â | Â | Â |
 | No | 1088 | 312475 | Referent |  |  |  |
 | Yes | 39 | 15215 | 0.80 | 0.58, 1.10 | 0.65 | 0.47, 0.91 |
Pre-eclampsia | Â | Â | Â | Â | Â | Â | Â |
 | No | 1057 | 308508 | Referent |  |  |  |
 | Yes | 70 | 19182 | 1.18 | 0.93, 1.50 | 1.13 | 0.88, 1.44 |
Area health service of residence | Â | Â | Â | Â | Â | Â | Â |
 | Sydney South West AHS | 291 | 74122 | 1.26 | 1.05, 1.53 | 1.23 | 1.01, 1.49 |
 | South Eastern Sydney & Illawarra AHS | 169 | 54949 | Referent |  |  |  |
 | Sydney West AHS | 239 | 62504 | 1.23 | 1.01, 1.50 | 1.17 | 0.96, 1.43 |
 | Northern Sydney & Central Coast AHS | 127 | 51340 | 0.80 | 0.64, 1.01 | 0.81 | 0.65, 1.02 |
 | Hunter & New England AHS | 139 | 37629 | 1.19 | 0.95, 1.49 | 1.16 | 0.92, 1.46 |
 | North Coast AHS | 58 | 18194 | 1.02 | 0.76, 1.38 | 0.99 | 0.73, 1.34 |
 | Greater Southern AHS | 43 | 14816 | 0.93 | 0.67, 1.30 | 0.90 | 0.65, 1.37 |
 | Greater Western AHS | 61 | 14136 | 1.40 | 1.04, 1.87 | 1.33 | 0.99,1.80 |
Mother’s Country of birth |  |  |  |  |  |  |  |
 | English speaking | 847 | 255602 | Referent |  |  |  |
 | Central and South America | 8 | 2862 | 0.85 | 0.42, 1.71 | 0.90 | 0.45, 1.81 |
 | Eastern Europe, Russia, Central Asian and Baltic States | 12 | 2136 | 1.68 | 0.95, 2.97 | 1.84 | 1.04, 3.25 |
 | Melanesia, Micronesia and Polynesia | 32 | 5801 | 1.67 | 1.17, 2.38 | 1.70 | 1.19, 2.44 |
 | Middle East and Africa | 82 | 14768 | 1.64 | 1.31, 2.06 | 1.74 | 1.38, 2.21 |
 | North East Asia | 27 | 12637 | 0.65 | 1.44, 0.96 | 0.72 | 0.49, 1.06 |
 | South East Asia | 58 | 18592 | 0.98 | 0.75, 1.28 | 1.05 | 0.80, 1.38 |
 | Southern Asia | 44 | 8802 | 1.53 | 1.13, 2.07 | 1.75 | 1.28, 2.39 |
 | Southern Europe | 14 | 3836 | 1.10 | 0.65, 1.87 | 1.10 | 0.65, 1.87 |
 | Western and Northern Europe | 3 | 2654 | 0.34 | 0.11, 1.04 | 0.35 | 0.11, 1.10 |