Table 1 Sociodemographic Characteristics of the Study Cohort.
Characteristics | Gestational age at birth (weeks) n = 64,810 n (%) | ||||||
|---|---|---|---|---|---|---|---|
Extremely preterm (< 28 weeks) | Very preterm (28–31 weeks) | Moderate/late preterm (32–36 weeks) | Early term (37–38 weeks) | Full-term (39–40 weeks) | Late-term (40–41 weeks) | Post-term (≥ 42 weeks) | |
132 (0.2) | 294 (0.5) | 3709 (5.7) | 21,107 (32.6) | 32,048 (49.4) | 7057 (10.9) | 463 (0.7) | |
Maternal | |||||||
Marital status | |||||||
Married (inc. de facto)a | 110 (83.3) | 228 (77.6) | 3141 (84.7) | 19,133 (90.6) | 28,834 (90.0) | 6241 (88.4) | 414 (89.4) |
Other | 22 (16.7) | 63 (21.4) | 534 (14.4) | 1778 (8.4) | 3007 (9.4) | 783 (11.1) | 44 (9.5) |
Unavailable | 0 (0.0) | < 5 (1.0) | 34 (0.9) | 196 (0.9) | 207 (0.6) | 33 (0.5) | 5 (1.1) |
Immigration status | |||||||
Immigrant | 110 (83.3) | 221 (75.2) | 2913 (78.5) | 16,172 (76.6) | 24,820 (77.4) | 5443 (77.1) | 357 (77.1) |
Non-immigranta | 20 (15.2) | 66 (22.4) | 721 (19.4) | 4709 (22.3) | 6942 (21.7) | 1548 (21.9) | 97 (21.0) |
Unavailable | < 5 (1.5) | 7 (2.4) | 75 (2.0) | 226 (1.1) | 286 (0.9) | 66 (0.9) | 9 (1.9) |
Occupation status quintileb | |||||||
0 to < 20 (lowest status) | 36 (27.3) | 71 (24.1) | 776 (20.9) | 4021 (19.1) | 5985 (18.7) | 1328 (18.8) | 88 (19.0) |
≥ 20 to < 40 | 31 (23.5) | 69 (23.5) | 868 (23.4) | 4880 (23.1) | 8057 (25.1) | 1945 (27.6) | 106 (22.9) |
≥ 40 to < 60 | 37 (28.0) | 65 (22.1) | 802 (21.6) | 4994 (23.7) | 7389 (23.1) | 1644 (23.3) | 112 (24.2) |
≥ 60 to < 80 | 7 (5.3) | 25 (8.5) | 344 (9.3) | 2177 (10.3) | 3074 (9.6) | 635 (9.0) | 39 (8.4) |
≥ 80 to 100 (highest status)a | 13 (9.8) | 35 (11.9) | 612 (16.5) | 3920 (18.6) | 5748 (17.9) | 1088 (15.4) | 93 (20.1) |
Unavailable | 8 (6.1) | 29 (9.9) | 307 (8.3) | 1115 (5.3) | 1795 (5.6) | 417 (5.9) | 35 (7.6) |
Age (years) | |||||||
< 20 | 12 (9.1) | 30 (10.2) | 227 (6.1) | 725 (3.4) | 1700 (5.3) | 458 (6.5) | 24 (5.2) |
20–24 | 22 (16.7) | 55 (18.7) | 623 (16.8) | 2695 (12.8) | 5363 (16.7) | 1448 (20.5) | 55 (11.9) |
25–29a | 38 (28.8) | 69 (23.5) | 971 (26.2) | 5387 (25.5) | 9173 (28.6) | 2067 (29.3) | 129 (27.9) |
30–34 | 28 (21.2) | 72 (24.5) | 1109 (29.9) | 7262 (34.4) | 10,075 (31.4) | 2002 (28.4) | 164 (35.4) |
35–39 | 28 (21.2) | 59 (20.1) | 632 (17.0) | 4162 (19.7) | 4870 (15.2) | 937 (13.3) | 79 (17.1) |
≥ 40 | < 5 (3.0) | 9 (3.1) | 147 (4.0) | 876 (4.2) | 867 (2.7) | 145 (2.1) | 12 (2.6) |
Ethnicity | |||||||
Caucasiana | 94 (71.2) | 208 (70.7) | 2892 (78.0) | 17,291 (81.9) | 26,284 (82.0) | 5893 (83.5) | 369 (79.7) |
Indigenous Australian | 21 (15.9) | 48 (16.3) | 409 (11.0) | 1245 (5.9) | 1833 (5.7) | 365 (5.2) | 32 (6.9) |
All other | 17 (12.9) | 38 (12.9) | 408 (11.0) | 2571 (12.2) | 3931 (12.3) | 799 (11.3) | 62 (13.4) |
Parity | |||||||
First birtha | 70 (53.0) | 131 (44.6) | 1639 (44.2) | 6809 (32.3) | 13,928 (43.5) | 3808 (54.0) | 229 (49.5) |
Second birth | 34 (25.8) | 88 (29.9) | 1060 (28.6) | 8386 (39.7) | 10,802 (33.7) | 1857 (26.3) | 124 (26.8) |
Third birth | 18 (13.6) | 32 (10.9) | 587 (15.8) | 3803 (18.0) | 4607 (14.4) | 835 (11.8) | 58 (12.5) |
≥ Fourth birth | 10 (7.6) | 43 (14.6) | 423 (11.4) | 2109 (10.0) | 2711 (8.5) | 557 (7.9) | 52 (11.2) |
Child | |||||||
Age category at time of AEDC collectionc | |||||||
≥ 4 years to < 5 years and 1 month | 26 (19.7) | 52 (17.7) | 665 (17.9) | 3684 (17.5) | 5531 (17.3) | 1241 (17.6) | 72 (15.6) |
≥ 5 years and 1 month to < 5 years and 10 monthsa | 89 (67.4) | 210 (71.4) | 2715 (73.2) | 15,603 (73.9) | 23,721 (74.0) | 5221 (74.0) | 358 (77.3) |
≥ 5 years and 10 months | 17 (12.9) | 32 (10.9) | 329 (8.9) | 1820 (8.6) | 2796 (8.7) | 595 (8.4) | 33 (7.1) |
Sex of child | |||||||
Male | 56 (42.4) | 163 (55.4) | 1960 (52.8) | 10,727 (50.8) | 15,939 (49.7) | 3544 (50.2) | 245 (52.9) |
Femalea | 76 (57.6) | 131 (44.6) | 1749 (47.2) | 10,380 (49.2) | 16,109 (50.3) | 3513 (49.8) | 218 (47.1) |
Language other than English spoken at home | |||||||
Noa | 117 (88.6) | 259 (88.1) | 3263 (88.0) | 18,759 (88.9) | 28,448 (88.8) | 6293 (89.2) | 394 (85.1) |
Yes | 15 (11.4) | 35 (11.9) | 446 (12.0) | 2348 (11.1) | 3600 (11.2) | 764 (10.8) | 69 (14.9) |
Attended preschool | |||||||
No | 8 (6.1) | 23 (7.8) | 271 (7.3) | 1419 (6.7) | 2100 (6.6) | 483 (6.8) | 35 (7.6) |
Yesa | 117 (88.6) | 257 (87.4) | 3277 (88.4) | 18,794 (89.0) | 28,697 (89.5) | 6291 (89.1) | 401 (86.6) |
Unavailable | 7 (5.3) | 14 (4.8) | 161 (4.3) | 894 (4.2) | 1251 (3.9) | 283 (4.0) | 27 (5.8) |
Reading status at home | |||||||
Not true | 9 (6.8) | 24 (8.2) | 319 (8.6) | 1202 (5.7) | 1657 (5.2) | 332 (4.7) | 23 (5.0) |
Somewhat true | 30 (22.7) | 83 (28.2) | 750 (20.2) | 3617 (17.1) | 5576 (17.4) | 1299 (18.4) | 80 (17.3) |
Very truea | 84 (63.6) | 154 (52.4) | 2314 (62.4) | 14,656 (69.4) | 22,297 (69.6) | 4832 (68.5) | 318 (68.7) |
Unavailable | 9 (6.8) | 33 (11.2) | 326 (8.8) | 1632 (7.7) | 2518 (7.9) | 594 (8.4) | 42 (9.1) |
Family | |||||||
Total siblings | |||||||
0a | 68 (51.5) | 159 (54.1) | 1806 (48.7) | 9888 (46.8) | 15,016 (46.9) | 3414 (48.4) | 232 (50.1) |
1 | 40 (30.3) | 81 (27.6) | 1187 (32.0) | 7245 (34.3) | 11,156 (34.8) | 2407 (34.1) | 141 (30.5) |
2 | 18 (13.6) | 38 (12.9) | 473 (12.8) | 2799 (13.3) | 4112 (12.8) | 878 (12.4) | 59 (12.7) |
≥ 3 | 6 (4.5) | 16 (5.4) | 243 (6.6) | 1175 (5.6) | 1764 (5.5) | 358 (5.1) | 31 (6.7) |
Index of Relative Socioeconomic Disadvantage (quintiles)b | |||||||
1 (most disadvantaged) | 25 (18.9) | 77 (26.2) | 743 (20.0) | 3237 (15.3) | 5238 (16.3) | 1333 (18.9) | 91 (19.7) |
2 | 37 (28.0) | 60 (20.4) | 696 (18.8) | 3559 (16.9) | 5839 (18.2) | 1342 (19.0) | 93 (20.1) |
3 | 16 (12.1) | 59 (20.1) | 604 (16.3) | 3755 (17.8) | 6149 (19.2) | 1469 (20.8) | 99 (21.4) |
4 | 23 (17.4) | 46 (15.6) | 783 (21.1) | 4670 (22.1) | 7094 (22.1) | 1488 (21.1) | 90 (19.4) |
5 (least disadvantaged)a | 25 (18.9) | 46 (15.6) | 806 (21.7) | 5357 (25.4) | 6986 (21.8) | 1245 (17.6) | 77 (16.6) |
Unavailable | 6 (4.5) | 6 (2.0) | 77 (2.1) | 529 (2.5) | 742 (2.3) | 180 (2.6) | 13 (2.8) |
