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Table 3 Adjusted risk factors for antepartum stillbirth by parity in New South Wales Australia 2002 – 2006

From: Risk factors for antepartum stillbirth and the influence of maternal age in New South Wales Australia: A population based study

  Nulliparous women Ante SB Births AHR 95% confidence interval Multiparous women Ante SB Births Adj HR 95% confidence interval
Indigenous         
Aboriginal or Torres Strait Islander 15 3586 0.97 0.57, 1.67 20 4535 1.19 0.74, 1.90
Not ATSI 610 169631 Ref   482 149938 Ref  
Maternal age (years)         
< 20 63 14002 1.23 0.90, 1.68 3 1219 0.77 0.24, 2.47
20 -24 117 33401 Ref   44 14901 Ref  
25-29 178 53542 1.07 0.84, 1.35 126 38461 1.22 0.86, 1.72
30-34 167 50180 1.16 0.90, 1.48 176 57550 1.26 0.90, 1.76
35-39 75 18510 1.45 1.08, 1.96 109 34238 1.36 0.95, 1.94
≥ 40 25 3582 2.58 1.67, 4.01 44 8104 2.32 1.52, 3.56
Preexisting diabetes         
No 616 172342 Ref   494 153459 Ref  
Yes 9 875 3.06 1.57, 5.97 8 1014 2.20 1.08, 4.50
Preexisting hypertension         
No 611 171422 Ref   484 152772 Ref  
Yes 14 1795 2.25 1.31, 3.85 18 1701 3.38 2.09, 5.49
Smoking during pregnancy         
No 511 152057 Ref   366 127134 Ref  
Yes 114 21160 1.71 1.37, 2.13 136 27339 1.93 1.56, 2.38
Baby gender         
Female 287 83575 Ref   260 74873 Ref  
Male 338 89642 1.11 0.95, 1.30 242 79600 0.88 0.74, 1.05
Gestational diabetes         
No 607 166321 Ref   481 146154 Ref  
Yes 18 6896 0.66 0.41, 1.06 21 8319 0.65 0.42, 1.02
Pre-eclampsia         
No 578 160272 Ref   479 148236 Ref  
Yes 47 12945 1.10 0.82, 1.49 23 6237 1.15 0.76, 1.76
Area health service of residence         
Sydney South West AHS 151 39377 1.13 0.88, 1.45 140 34745 1.39 1.02, 1.88
South Eastern Sydney & Illawarra AHS 106 31893 Ref   63 23056 Ref  
Sydney West AHS 135 32100 1.19 0.92, 1.54 104 30404 1.16 0.84, 1.59
Northern Sydney & Central Coast AHS 78 28913 0.80 0.60, 1.07 49 22427 0.83 0.57, 1.20
Hunter & New England AHS 77 18615 1.19 0.88, 1.61 62 19014 1.14 0.80, 1.63
North Coast AHS 30 8621 0.98 0.65, 1.48 28 9573 1.00 0.64, 1.57
Greater Southern AHS 21 7024 0.85 0.53, 1.37 22 7792 0.97 0.60, 1.59
Greater Western AHS 27 6674 1.14 0.74, 1.75 34 7462 1.56 1.02, 2.39
Mother’s Country of birth         
English speaking 483 136476 Ref   364 119126 Ref  
Central and South America 4 1556 0.77 0.29, 2.07 4 1306 1.07 0.40, 2.89
Eastern Europe, Russia, Central Asian and Baltic States 5 1343 1.15 0.48, 2.78 7 793 3.27 1.54, 6.94
Melanesia, Micronesia and Polynesia 11 2320 1.42 0.78, 2.59 21 3481 1.92 1.22, 3.01
Middle East and Africa 33 6049 1.60 1.11, 2.29 49 8719 1.86 1.35, 2.55
North East Asia 19 7338 0.81 0.51, 1.29 8 5299 0.57 0.28, 1.15
South East Asia 32 9898 1.03 0.71, 1.49 26 8694 1.08 0.71, 1.63
Southern Asia 30 4843 2.00 1.37, 2.93 14 3959 1.36 0.79, 2.35
Southern, Western and Northern Europe 8 3394 0.68 0.34, 1.37 9 3096 0.96 0.49, 1.87
Previous birth by CS         
No      402 125257 Ref  
Yes      100 29216 1.24 0.99, 1.55