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Table 6 Infant demographic and birth-related characteristics by linkage group for liveborn singleton births, 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 = 13469
n(%) n(%) n(%) n(%) n(%)
Sex
  Male 343 655 (51.5) 5 782 (51.1) 4 851 (50.8) 1 484 (49.2) 6 867 (51.0)
  Female 323 261 (48.4) 5 517 (48.8) 4 698 (49.2) 1 496 (49.6) 6 599 (49.0)
Birthweight < 1000 grams 1 948 (0.3) 118 (1.0) 30 (0.3) 16 (0.5) 89 (0.7)
Preterm birth 35 776 (5.4) 806 (7.1) 621 (6.5) 165 (5.5) 745 (5.5)
Agpar1 < 4 12 642 (1.9) 307 (2.7) 198 (2.1) 48 (1.6) 186 (1.4)
Admission to SCN/NICU 100 498 (15.1) 1 908 (16.9) 1 534 (16.1) 440 (14.6) - (-)
Death in hospital 1 714 (0.3) 125 (1.1) 36 (0.4) 21 (0.7) 81 (0.6)
  1. SCN: Special Care Unit.
  2. NICU: Neonatal Intensive Care Unit.