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Table 1 Maternal and infant characteristics of the population

From: The association between intrapartum interventions and immediate and ongoing breastfeeding outcomes: an Australian retrospective population-based cohort study

  All births
(N = 599,191)a
Births that linked to CDIS dataset (N = 105,599)a
  N (%) N (%)
Parity
 Primiparous 269,018 (44.9) 48,526 (46.0)
 Multiparous 330,132 (55.1) 57,073 (54.0)
Sex of Baby
 Male 306,177 (51.1) 54,184 (51.3)
 Female 292,821 (48.9) 51,415 (48.7)
Admission Type
 Public hospital 444,742 (74.2) 74,781 (70.8)
 Private hospital 154,449 (25.8) 30,797 (29.2)
Maternal Age Group
  < 25 years 69,222 (11.6) 9301 (8.8)
 25–29 years 157,697 (26.3) 26,426 (25.0)
 30–34 years 220,975 (36.9) 41,845 (39.6)
 35–39 years 123,308 (20.6) 23,124 (21.9)
 40 years or older 27,800 (4.6) 4903 (4.6)
BMI
 Mean (SD) 25.78 (5.79) 25.58 (5.62)
Marital Status
 Married 424,745 (71.8) NA
 De facto 102,758 (17.4) NA
 Single 63,944 (10.8) NA
Gestation (completed weeks)
 37 48,828 (4.1) 9161 (8.7)
 38 138,038 (23.0) 25,157 (23.8)
 39 175,726 (29.3) 32,090 (30.4)
 40 156,018 (26.0) 27,201 (25.8)
 41 76,262 (12.7) 11,561 (10.9)
 42 or more 4319 (0.7) 425 (0.4)
SEIFA quintile
 1 (most disadvantaged) 109,356 (19.5) 17,513 (16.7)
 2 111,313 (19.8) 20,151 (19.3)
 3 113,055 (20.1) 21,927 (21.0)
 4 113,558 (20.2) 21,824 (20.9)
 5 (least disadvantaged) 114,685 (20.4) 23,206 (22.2)
Smoking status during pregnancy
 Yes 53,029 (9.2) 7038 (7.0)
Country of Birth Region
 Australia 378,658 (63.6) 69,426 (66.1)
 Oceania and Antarctica 16,610 (2.8) 2258 (2.1)
 Americas 8338 (1.4) 1244 (1.2)
 South-East Asia 38,698 (6.5) 6148 (5.8)
 Southern and Central Asia 60,621 (10.2) 9827 (9.3)
 North-East Asia 29,507 (5.0) 6220 (5.9)
 North-West Europe 17,760 (3.0) 3280 (3.1)
 Southern and Eastern Europe 11,524 (1.9) 1676 (1.6)
 North Africa and the Middle East 20,718 (3.5) 3125 (3.0)
 Sub-Saharan Africa 13,076 (2.2) 1906 (1.8)
  1. Abbreviation: BMI body mass index, SEIFA Socio-Economic Indexes for Areas, NA not available
  2. aMissing values are excluded from the denominator