TABLE 3

Proportion of Infants With Selected Perinatal Characteristics Admitted to the NICU at 24 Weeks

Characteristic PresentNICU Admitted Out of Total With Characteristic, n (%)Comparative CharacteristicNICU Admitted Out of Total With Comparative Characteristic, n (%)RRRR 95% CIP
Live birth560 of 696 (80)Stillbirth0 of 459 (0)
Maternal age, yMaternal age, y
 <2041 of 46 (89) >20519 of 650 (80)1.121.00–1.24.13
 20–34387 of 492 (79) <20 or >34173 of 204 (85)0.930.86–1.00.07
 ≥35132 of 161 (82) <35428 of 535 (80)1.020.94–1.11.58
Multiple pregnancy140 of 175 (80)Singleton420 of 521 (81)0.990.91–1.08.86
Breech or other272 of 332 (82)Vertex288 of 364 (79)1.040.96–1.11.35
Onset of laborOnset of labor
 Spontaneous459 of 531 (86) Nonspontaneous101 of 165 (61)1.411.24–1.60<.001
 No labor105 of 110 (95) With labor455 of 586 (78)1.231.16–1.30<.001
Cesarean delivery222 of 231 (96)Vaginal delivery338 of 465 (73)1.321.24–1.41<.001
Birth wt, gBirth wt, g
 <50027 of 32 (84) >500533 of 664 (80)1.050.90–1.23.57
 500–59983 of 108 (77) <500 or ≥600477 of 588 (81)0.950.85–1.06.30
 600–699233 of 293 (80) <600 or ≥700327 of 403 (81)0.980.91–1.06.60
 700–799151 of 181 (83) <700 or ≥800409 of 515 (79)1.050.97–1.14.24
 ≥80066 of 78 (85) <800494 of 618 (80)1.060.96–1.17.33
Boy297 of 382 (78)Girl263 of 314 (84)0.930.86–1.00.05
  • Denominators are total numbers of live-born infants with the indicated characteristics (from the AIHW NPDC). Numerators indicate NICU admission with the characteristic (using data from all Australian NICUs from the ANZNN data set). RR indicates the likelihood of NICU admission with a characteristic present compared with the likelihood of admission with the comparative characteristic.