Subgroup | 24 weeks | 25 weeks | 26+ weeks | |||
---|---|---|---|---|---|---|
Year NICU admissions* | 2000–2005 (N=72) N (%) | 2007–2011 (N=197) N (%) | 2000–2005 (N=359) N (%) | 2007–2011 (N=493) N (%) | 2000–2005 (N=4823) N (%) | 2007–2011 (N=3769) N (%) |
Birth weight (g) (mean±SD) | 769±256 | 696±110 | 827±225 | 809±134 | 1088±285 | 1105±276 |
Male gender | 46 (63.9) | 105 (53.3) | 192 (53.5) | 264 (53.6) | 2707 (56.1) | 2046 (54.3) |
Small-for-gestational age | c.d.† | c.d.† | 11 (3.1) | 28 (5.7) | 321 (6.7) | 195 (5.2)‡ |
Maternal age (years) | ||||||
<20 | 5 (6.9) | 6 (3.1) | 13 (3.6) | 9 (1.8) | 96 (2.0) | 74 (2.0) |
20–35 | 31 (43.1) | 137 (69.5) | 180 (50.1) | 363 (73.6) | 2746 (56.9) | 2679 (71.1) |
>35 | 6 (8.3) | 38 (19.3) | 54 (15.0) | 81 (16.4)‡ | 675 (14.0) | 751 (19.9)‡ |
Missing | n.a.§ | 16 (8.2) | n.a.§ | 40 (8.1) | n.a.§ | 265 (7.0) |
Socio-economic status | ||||||
Very high | 5 (6.9) | 30 (15.2) | 45 (12.5) | 78 (15.8) | 729 (15.1) | 538 (14.3) |
High | 7 (9.7) | 33 (16.8) | 61 (17.0) | 69 (14.0) | 872 (18.1) | 584 (15.5) |
Medium | 13 (18.1) | 20 (10.2) | 61 (17.0) | 68 (13.8) | 803 (16.7) | 546 (14.5) |
Low | 14 (19.4) | 38 (19.3) | 69 (19.2) | 71 (14.4) | 909 (18.9) | 628 (16.7) |
Very low | 33 (45.8) | 59 (30.0)‡ | 117 (32.6) | 165 (33.5) | 1408 (29.2) | 1088 (28.9) |
Missing | 0 (0.0) | 17 (8.6) | 6 (1.7) | 42 (8.5) | 102 (2.1) | 385 (10.2) |
Method of birth | ||||||
Vaginal head | 39 (54.2) | 141 (71.6) | 169 (42.1) | 293 (59.4) | 1352 (28.0) | 1556 (41.3) |
Vaginal breech | 8 (11.2) | 39 (19.8) | 51 (14.2) | 84 (17.0) | 319 (6.6) | 265 (7.0) |
Caesarean section | 0 (0.0) | 8 (4.1) | 30 (8.4) | 82 (16.6) | 2238 (46.4) | 1794 (47.6)‡ |
Missing | n.a.§ | 9 (4.6) | n.a.§ | 34 (6.9) | n.a.§ | 154 (4.1) |
Multiple birth | 27 (37.5) | 65 (33.0) | 122 (34.0) | 169 (34.8) | 1492 (30.9) | 1154 (30.6) |
Missing | 1 (1.4) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 0 (0.0) | 1 (0.0) |
Inborn | 44 (61.1) | 187 (94.9)‡ | 253 (70.5) | 440 (90.2)‡ | 3161 (65.5) | 3292 (89.1)‡ |
Missing | 0 (0.0) | 0 (0.0) | 0 (0.0) | 5 (1.0) | 0 (0.0) | 71 (1.9) |
*Met the inclusion criteria (admitted to an NICU, >500 g birth weight without congenital malformations).
†c.d. indicates cannot be determined since no p values were available at 24 weeks.
‡χ2: p<0.05 after (2007–2011) versus before (2000–2005) the guideline modification.
§n.a. indicates not applicable, since no data available in the LNR before 2008.
NICU, neonatal intensive care unit.