Table 1.
Study population characteristics: infants born ≥24 wk gestation between 2010 and 2014 (2008‐2012 for Sweden) and surviving to postnatal discharge
|
Scotland N = 173 316 No. (%) |
England N = 1 812 784 No. (%) |
NSW N = 231 306 No. (%) |
Ontario N = 472 151 No. (%) |
Sweden N = 313 192 No. (%) |
|
|---|---|---|---|---|---|
| Maternal age (y) | |||||
| 15‐19 | 12 123 (7.1) | 109 990 (6.1) | 8839 (3.8) | 17 797 (3.8) | 6058 (1.9) |
| 20‐24 | 39 005 (22.7) | 414 800 (22.9) | 37 559 (16.2) | 73 387 (15.5) | 53 084 (16.9) |
| 25‐29 | 59 281 (34.3) | 631 949 (34.9) | 81 812 (35.4) | 168 442 (35.7) | 116 138 (37.1) |
| 30‐34 | 62 907 (35.9) | 656 045 (36.2) | 103 096 (44.6) | 212 525 (45.0) | 137 912 (44.0) |
| Quintile of deprivationa | |||||
| Most deprived | 44 536 (26.0) | 549 232 (30.3) | 49 381 (21.3) | 110 916 (23.5) | 62 631 (20.0) |
| 2 | 37 955 (21.9) | 416 681 (23.0) | 32 275 (14.0) | 98 656 (20.9) | 62 663 (20.0) |
| 3 | 34 961 (19.7) | 329 807 (18.2) | 45 737 (19.8) | 96 585 (20.5) | 62 586 (20.0) |
| 4 | 29 040 (16.7) | 273 082 (15.1) | 42 966 (18.6) | 96 540 (20.4) | 62 669 (20.0) |
| Most affluent | 26 797 (15.6) | 243 982 (13.5) | 60 947 (26.3) | 69 454 (14.7) | 62 643 (20.0) |
| Gestational age (wk) | |||||
| 24‐27 | 265 (0.1) | 2968 (0.2) | 351 (0.2) | 836 (0.2) | 250 (0.1) |
| 28‐31 | 987 (0.5) | 8980 (0.5) | 934 (0.4) | 2076 (0.4) | 632 (0.2) |
| 32‐33 | 1093 (0.6) | 11 560 (0.6) | 1372 (0.6) | 2835 (0.6) | 922 (0.3) |
| 34‐36 | 6905 (4.0) | 72 021 (4.0) | 9418 (4.1) | 21 104 (4.5) | 8916 (2.8) |
| 37‐38 | 28 047 (16.3) | 315 477 (17.4) | 54 623 (23.6) | 119 697 (25.4) | 55 987 (17.9) |
| ≥39 | 136 019 (78.5) | 1 401 778 (77.3) | 164 608 (71.2) | 325 603 (69.0) | 246 485 (78.7) |
a
Quintiles are based on the whole population except for Sweden, where quintiles are based on the study population.