| Western Australia (2000–2013) | New South Wales (2002–2008) | ||||
---|---|---|---|---|---|---|
Aboriginal | Aboriginal | Non-Aboriginal | ||||
Perinatal outcomes | Twin N = 880 n (%) | Singleton N = 33,229 n (%) | Twin N = 794 n (%) | Singleton N = 31,524 n (%) | Twin N = 18,338 n (%) | Singleton N = 582,355 n (%) |
Groups compared and statistical significance reported1 | A | A | B | B | C | C |
 |  | D |  | D |  | |
All births | N = 880 | N = 33,229 | N = 794 | N = 31,524 | N = 18,338 | N = 582,355 |
 StillbirthaC | 20 (2) | 398 (1) | 10 (1) | 262 (1) | 332 (2) | 3295 (1) |
Live births only | N = 860 | N = 32,831 | N = 784 | N = 31,262 | N = 18,006 | N = 579,060 |
 Neonatal deathABC | 29 (3) | 147 (< 1) | 20 (3) | 105 (< 1) | 294 (2) | 1182 (< 1) |
 Birth weight (grams) (mean (SD)) | 2225 (682) | 3207 (636) | 2311 (661) | 3283 (622) | 2436 (605) | 3419 (545) |
 Birth weight bands ABCD | ||||||
  < 1000 | 59 (7) | 252 (1) | 35 (4) | 174 (1) | 535 (3) | 1673 (< 1) |
  1000–1499 | 67 (8) | 315 (1) | 67 (9) | 224 (1) | 840 (5) | 2070 (< 1) |
  1500–1999 | 153 (18) | 709 (2) | 101 (13) | 549 (2) | 2213 (12) | 4458 (1) |
  2000–2499 | 240 (28) | 2292 (7) | 239 (31) | 1895 (6) | 5101 (28) | 16,228 (3) |
  2500–2999 | 248 (29) | 7097 (22) | 251 (32) | 5970 (19) | 6477 (36) | 81,429 (14) |
  3000–3499 | 88 (10) | 11,544 (35) | 72 (9) | 10,742 (34) | 2498 (14) | 212,821 (37) |
  3500+ | 5 (1) | 10,622 (32) | 18 (2) | 11,695 (37) | 320 (2) | 260,131 (45) |
 Gestational age (median (IQR)) | 36 (33, 37) | 39 (38, 40) | 36 (34, 37) | 39 (38, 40) | 37 (35, 38) | 39 (38, 40) |
 Gestational age categories ABCD | ||||||
  20–23 | 22 (3) | 62 (< 1) | 9 (1) | 52 (< 1) | 152 (1) | 479 (< 1) |
  24–27 | 30 (3) | 183 (1) | 24 (3) | 139 (< 1) | 345 (2) | 1200 (< 1) |
  28–31 | 68 (8) | 414 (1) | 75 (10) | 261 (1) | 1001 (6) | 2712 (< 1) |
  32–34 | 198 (23) | 922 (3) | 126 (16) | 743 (2) | 2658 (15) | 7137 (1) |
  35–36 | 240 (28) | 2329 (7) | 211 (27) | 1638 (5) | 4475 (25) | 18,783 (3) |
  37–38 | 279 (32) | 10,030 (31) | 292 (38) | 7119 (23) | 8216 (46) | 124,134 (21) |
  39+ | 23 (3) | 18,846 (57) | 31 (4) | 21,298 (68) | 861 (5) | 424,508 (73) |
 ResuscitationABC | 449 (52) | 11,170 (34) | 455 (58) | 13,190 (42) | 10,463 (58) | 235,578 (41) |
 Length of stay (median (IQR) in days)A | 7 (4–14) | 3 (2–4) | – | – | – | – |
 Admitted to NICU or SCN2,ABCd | 452 (64) | 4343 (29) | 500 (64) | 5984 (19) | 10,521 (57) | 82,257 (14) |
 Cerebral palsy. | 5 (1) | 114 (< 1) | – | – | – | – |
 Respiratory distress syndrome of newbornsA | 146 (17) | 883 (3) | – | – | – | – |
Maternal outcomes | ||||||
 PPH requiring blood transfusionAC | 36 (4) | 607 (2) | 10 (3) | 403 (3) | 175 (3) | 3389 (2) |
 Mother’s length of stay (median (IQR) in days)A | 6 (4–8) | 3 (2–5) | – | – | – | – |