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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
  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)