Univariate analysis: perinatal factors significantly (p<0.05) associated with death for 5713 infants born after 24 weeks and before 32 weeks in 1998–9
| Perinatal characteristic | Died/total (%) | Unadjusted OR (95% CI) | p Value | Missing |
|---|---|---|---|---|
| GA, Gestational age. | ||||
| Sex | <0.0001 | 0 | ||
| Male | 254/3171 (8) | 1.54 (1.24 to 1.91) | ||
| Female | 136/2542 (5) | 1.00 | ||
| GA(weeks) | <0.0001 | 0 | ||
| 31 | 17/1352 (1) | 1.00 | ||
| 30 | 26/1080 (2) | 1.94 (1.05 to 3.59) | ||
| 29 | 31/945 (3) | 2.66 (1.47 to 4.84) | ||
| 28 | 41/770 (5) | 4.41 (2.49 to 7.82) | ||
| 27 | 63/609 (10) | 9.06 (5.25 to 15.61) | ||
| 26 | 97/548 (18) | 16.88 (9.97 to 28.57) | ||
| 25 | 115/409 (28) | 30.70 (18.17 to 51.87) | ||
| Weight for GA (centile) | <0.001 | 0 | ||
| 97+ | 8/92 (9) | 1.58 (0.75 to 3.31) | ||
| 90–<97 | 12/297 (4) | 0.70 (0.38 to 1.27) | ||
| 75–<90 | 37/874 (4) | 0.73 (0.51 to 1.05) | ||
| 25–<75 | 168/2949 (6) | 1.00 | ||
| 10–<25 | 81/900 (9) | 1.64 (1.24 to 2.16) | ||
| 3–<10 | 37/397 (9) | 1.70 (1.17 to 2.47) | ||
| <3 | 47/204 (23) | 4.96 (3.45 to 7.11) | ||
| 1 min Apgar score | <0.0001 | 0 | ||
| 4–10 | 227/4690 (5) | 1.00 | ||
| <4 | 163/1023 (16) | 3.73 (3.01 to 4.62) | ||
| Maternal ethnicity | 0.008 | 503 | ||
| Caucasian/other | 301/4268 (7) | 1.00 | ||
| Asian | 17/329 (5) | 0.72 (0.44 to 1.19) | ||
| Indigenous Australian | 32/257 (12) | 1.88 (1.27 to 2.76) | ||
| Maori | 9/119 (8) | 1.08 (0.54 to 2.15) | ||
| Pacific Islander | 11/237 (5) | 0.64 (0.35 to 1.19) | ||
| Presentation | 0.004 | 642 | ||
| Cephalic | 213/3380 (6) | 1.00 | ||
| Breech | 129/1427 (9) | 1.48 (1.18 to 1.86) | ||
| Other | 18/264 (7) | 1.09 (0.66 to 1.79) | ||
| Transferred after birth (outborn) | 0 | |||
| Yes | 54/584 (9) | 1.45 (1.08 to 1.96) | 0.01 | |
| No | 336/5129 (6) | 1.00 | ||
| Hypertensive disease in pregnancy | ||||
| Yes | 64/1254 (5) | 0.68 (0.52 to 0.90) | 0.006 | 62 |
| No | 333/4397 (7) | 1.00 | ||
| Fetal distress | 0.02 | 499 | ||
| Yes | 92/1061 (9) | 1.34 (1.05 to 1.71) | ||
| No | 275/4153 (7) | 1.00 | ||