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Table 2 Maternal and infant characteristics of all births, by intrapartum intervention

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

  Method of Birth Epidural Analgesia Synthetic oxytocin infusion
Vaginal birth (n = 408,383) Pre-labour CS (n = 114,251) In-labour CS (n = 76,516) No
(n = 442,796)
Yes
(n = 156,395)
No
(n = 413,563)
Yes
(n = 185,628)
Parity
 Primiparous 180,921 (44.3) 31,813 (27.8) 56,259 (73.5) 160,620 (36.3) 108,398 (69.3) 147,368 (35.6) 121,650 (64.4)
Multiparous 227,433 (55.7) 82,431 (72.2) 20,252 (26.5) 282,143 (69.7) 47,989 (30.7) 266,170 (65.5) 63,962 (34.5)
Admission Type
 Public 317,464 (77.7) 71,240 (62.4) 56,030 (73.2) 339,853 (76.8) 104,889 (67.1) 308,281 (74.5) 136,461 (73.5)
 Private 90,919 (22.3) 43,011 (37.6) 20,486 (26.8) 102,943 (23.2) 51,506 (32.9) 105,282(25.5) 49,167 (26.5)
Maternal age (years), mean (SD)
  30.41 (5.18) 32.99 (4.96) 30.78 (5.08) 31.10 (5.28) 30.54 (5.05) 31.15 (5.24) 30.51 (5.16)
Maternal BMI, mean (SD)
  25.31 (23.45) 27.23 (31.24) 26.49 (6.08) 25.82 (22.67) 25.84 (26.73) 25.73 (28.32) 26.06 (5.99)
Marital Status
 Married 284,337 (66.9) 87,479 (77.3) 52,897 (70.0) 315,540 (72.2) 109,205 (70.7) 296,453 (72.6) 128,292 (70.0)
 De Facto 71,668 (17.8) 17,144 (15.2) 13,938 (18.5) 74,858 (17.1) 27,900 (18.1) 69,219 (17.0) 33,539 (18.3)
 Single 46,784 (11.6) 8479 (7.5) 8690 (11.5) 46,560 (10.7) 17,384 (11.3) 42,528 (10.4) 21,416 (11.7)
Gestation (completed weeks), mean (SD)
  39.27 (1.15) 38.49 (0.94) 39.43 (1.25) 39.06 (1.15) 39.37 (1.19) 39.08 (1.13) 39.30 (1.26)
Birth Weight (grams), mean (SD)
  3450 (488) 3413 (507) 3510 (515) 3443 (498) 3474 (489) 3455 (492) 3442 (505)
SEIFA quintile
 1 more disadvantaged 77,744 (20.3) 17,496 (16.3) 14,111 (19.7) 85,568 (20.6) 23,788 (16.2) 76,129 (19.7) 33,227 (19.0)
 2 76,561 (20.0) 20,073 (18.7) 14,673 (20.5) 83,648 (20.2) 27,665 (18.8) 76,731 (19.8) 34,582 (19.8)
 3 76,745 (20.1) 21,636 (20.1) 14,667 (20.5) 83,361 (20.1) 29,694 (20.2) 77,844 (20.1) 35,211 (20.1)
 4 75,861 (19.8) 23,237 (21.6) 14,451 (20.2) 81,971 (19.8) 31,587 (21.5) 77,824 (20.1) 35,734 (20.4)
 5 least disadvantaged 75,829 (19.8) 25,101 (23.3) 13,742 (19.2) 80,173 (19.3) 34,512 (23.4) 78,548 (20.3) 36,137 (20.7)
Smoking status during pregnancy
 Yes 37,890 (9.6)a 8345 (7.7) 6790 (9.3)a 39,256 (9.2)b 13,773 (9.3)b 36,008 (9.1) 17,021 (9.5)
  1. Abbreviation: BMI body mass index, SEIFA Socio-Economic Indexes for Areas, CS caesarean section
  2. Data given as number (proportion %) unless otherwise specified. Proportions reported as column percentages
  3. P-value for differences in characteristics between methods of birth, use of epidural analgesia and synthetic oxytocin infusion < 0.001 unless otherwise specified
  4. aP-value for smoking status during pregnancy between vaginal birth and in-labour CS = 0.011
  5. bP-value for smoking status during pregnancy between no epidural analgesia and yes epidural analgesia = 0.709