Table 5 Maternal demographic and birth-related characteristics by linkage group for liveborn singleton pregnancies, NSW 2001-2008
From: Investigating linkage rates among probabilistically linked birth and hospitalization records
Variable | Birth-hospital record linked groups | Unlinked groups | |||
|---|---|---|---|---|---|
| Â | Mothers and infants | Mothers only | Infants only | Birth records | Hospital records |
N = 667315 | N = 11312 | N = 9553 | N = 3017 | N = 8145 | |
n(%) | n(%) | n(%) | n(%) | n(%) | |
Maternal age | |||||
 < 25 | 122 417 (18.3) | 2 837 (25.1) | 1 870 (19.6) | 418 (13.9) | 1 691 (20.7) |
 26-34 | 407 468 (61.1) | 6 418 (56.7) | 5 779 (60.5) | 1 916 (63.5) | 4 753 (58.3) |
 35+ | 137 304 (20.6) | 2 055 (18.2) | 1 851 (19.4) | 679 (22.5) | 1 716 (21.0) |
Marital status (Married) | 546 152 (81.8) | 8 167 (72.2) | - (-) | - (-) | 6 343 (77.7) |
Parity | |||||
 0 | 277 713 (41.6) | 5 077 (44.9) | 3 994 (41.8) | 1 378 (45.7) | - (-) |
 1 | 224 843 (33.7) | 3 561 (31.5) | 2 879 (30.1) | 976 (32.4) | - (-) |
 2 | 102 521 (15.4) | 1 533 (13.6) | 1 410 (14.7) | 390 (12.9) | - (-) |
 3+ | 61 127 (9.2) | 1 123 (9.9) | 1 248 (13.1) | 255 (8.5) | - (-) |
Australian born mother | 478 317 (71.7) | 7 458 (65.9) | 6 847 (71.7) | 2 233 (74.0) | 5 740 (70.3) |
Social disadvantage | |||||
 1 (Least) | 140 069 (21.0) | 2 711 (24.0) | 1 835 (19.2) | 919 (30.5) | 2 044 (25.1) |
 2-4 | 367 930 (55.1) | 5 596 (49.5) | 5 143 (53.8) | 1 463 (48.5) | 4 084 (50.1) |
 5 (Greatest) | 158 193 (23.7) | 2 918 (25.8) | 2 483 (26.0) | 592 (19.6) | 2 030 (24.9) |
Smoked during pregnancy | 95 866 (14.4) | 2 225 (19.7) | 1 904 (19.9) | 374 (12.4) | - (-) |
Antenatal care ≥ 15 weeks | 164 940 (24.7) | 3 416 (30.2) | 2 598 (27.2) | 616 (20.4) | - (-) |
Diabetes | 34 760 (5.2) | 531 (4.7) | 428 (4.5) | 115 (3.8) | 385 (4.7) |
Hypertension | 50 582 (7.6) | 760 (6.7) | 490 (5.1) | 157 (5.2) | 551 (6.8) |
Placental abruption | 2 555 (0.4) | 68 (0.6) | - (-) | - (-) | 35 (0.4) |
Placenta praevia | 3 595 (0.5) | 56 (0.5) | - (-) | - (-) | 127 (1.6) |
Induction of labour | 166 647 (25.0) | 2 633 (23.3) | 2 146 (22.5) | 739 (24.5) | 1 465 (18.0) |
Delivery by caesarean | 179 528 (26.9) | 3 189 (28.2) | 2 028 (21.2) | 906 (30.0) | 2 136 (26.2) |
Duration of pregnancy < 26 weeks | 1 166 (0.2) | 92 (0.8) | 21 (0.2) | 13 (0.4) | 68 (0.8) |
Birth in private hospital | 168 036 (25.2) | 3 486 (30.8) | 1 939 (20.3) | 1 731 (57.4) | 2 047 (25.1) |