Characteristics of the high risk cohort divided into gestational age groups (weeks)
| Characteristics | 21–27 (n=397) | 28–31 (n=844) | 32–36 (n=1244) | 37–44 (n=883) | All (n=3368) |
|---|---|---|---|---|---|
| Values are numbers with percentages in parentheses. | |||||
| Maternal ethnicity | |||||
| Maori | 91 (23) | 183 (22) | 226 (19) | 184 (21) | 684 (21) |
| Pacific Islander | 39 (10) | 62 (7) | 86 (7) | 111 (13) | 298 (9) |
| Caucasian | 241 (61) | 533 (64) | 844 (69) | 511 (60) | 2129 (64) |
| Asian | 24 (6) | 47 (6) | 56 (5) | 36 (4) | 163 (5) |
| Source of referral to hospital | |||||
| Booked at hospital | 176 (48) | 453 (62) | 750 (71) | 491 (62) | 1870 (63) |
| In utero transport | 149 (41) | 229 (31) | 189 (18) | 31 (4) | 598 (20) |
| Ex utero transport | 35 (10) | 45 (6) | 109 (10) | 257 (33) | 446 (15) |
| Other | 6 (2) | 8 (1) | 9 (1) | 10 (1) | 33 (1) |
| Place of birth | |||||
| Level III hospital | 358 (90) | 714 (85) | 933 (75) | 478 (55) | 2483 (74) |
| Level II hospital | 30 (8) | 105 (12) | 255 (21) | 219 (25) | 609 (18) |
| Infants from multiple birth | 93 (23) | 257 (30) | 276 (22) | 18 (2) | 644 (19) |
| Male sex | 221 (56) | 447 (53) | 732 (59) | 552 (63) | 1952 (58) |
| Intubated at resuscitation | 295 (74) | 216 (26) | 143 (12) | 172 (20) | 826 (25) |
| Apgar score <4 at 5 min | 25 (6) | 10 (1) | 17 (1) | 47 (5) | 99 (3) |
| Major congenital malformation | 14 (4) | 48 (6) | 83 (7) | 163 (19) | 308 (9) |