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Table 1 Maternal, pregnancy and maternity care characteristics of low risk women for elective repeat caesarean section (ERCS)

From: Rate of spontaneous onset of labour before planned repeat caesarean section at term

  Spontaneous labour <39 weeks N = 1,473 N (Col.%)a ERCS ≥39 weeks N = 15,841 N (Col.%)a P value
Maternal and Pregnancy Characteristics  
Age (years)    0.87
<20 10 (0.7) 96 (0.6)  
20 - <35 922 (62.6) 10,005 (63.2)  
> = 35 541 (36.7) 5,739 (36.2)  
Country of birth <0.001
Australian 1,013 (68.9) 11,650 (73.7)  
Asian 258 (17.6) 1,980 (12.5)  
Other 199 (13.5) 2,177 (13.8)  
Socio-economic status  
Most disadvantaged 293 (20.1) 2,851 (18.2) 0.24
Disadvantaged 254 (17.5) 2,763 (17.7)  
Average 263 (18.1) 2,734 (17.5)  
Advantaged 259 (17.8) 3,082 (19.7)  
Most advantaged 386 (26.5) 4,210 (26.9)  
Smoking in pregnancy 176 (12.0) 1,385 (8.7) <0.001
No. of previous vaginal births 0.16
0 1,256 (87.1) 13,716 (88.8)  
1 133 (9.2) 1,261 (8.2)  
≥2 53 (3.7) 478 (3.1)  
No. of previous CS    0.001
1 1,013 (70.2) 11,513 (74.5)  
2 358 (24.8) 3,315 (21.5)  
≥3 73 (5.1) 630 (4.1)  
Prior delivery history b    <0.001
Spontaneous preterm 102 ( 6.9) 300 (1.9)  
Planned preterm 65 ( 4.4) 382 (2.4)  
Spontaneous term 570 (38.7) 4,685 (29.6)  
Planned term 512 (34.8) 8,210 (51.8)  
Unavailable 224 (15.2) 2,264 (14.3)  
Vertex Presentation 1,440 (97.8) 15,471 (97.7) 0.82
Size at birth    0.03
<10th percentile 81 (5.5) 822 (5.2)  
10th - 90th percentile 1,194 (81.1) 12,480 (78.8)  
>90th percentile 197 (13.4) 2,532 (16.0)  
Maternity Care Characteristics
Care type (private) 700 (47.5) 7,624 (48.1) 0.66
Antenatal care (<20w) 1,390 (94.4) 14,963 (94.5) 0.88
Birth hospital type
Private 533 (36.2) 6,064 (38.3) 0.19
Tertiary 483 (32.8) 5,260 (33.2)  
Other (urban) 225 (15.3) 2,184 (13.8)  
Other (rural) 232 (15.8) 2,333 (14.7)  
  1. aPercentages may not add to 100 because of missing data.
  2. bIncorporates spontaneous onset of labour or planned delivery (by labour induction or prelabour caesarean section) for the lowest gestation of all prior births.