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Table 2 Among low risk women for elective repeat caesarean section (ERCS), the factors associated with spontaneous labour at 37-38 weeks

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

  Total low risk women N = 17,314 Spontaneous labour <39 weeks N = 1,473 Crude RR (95% CI) Adjusted RRb(95% CI)
   N Rate (Row%)a   
Age (years)      
<20 106 10 9.4 1.12 (0.62, 2.02)  
20 - <35 10,927 922 8.4 1.00  
> = 35 6,280 541 8.6 1.02 (0.92, 1.13)  
Country of birth
Australian 12,663 1,013 8.0 1.00 1.00
Asian 2,238 258 11.5 1.44 (1.27, 1.64) 1.53 (1.33, 1.75)
Other 2,376 199 8.4 1.05 (0.91, 1.21) 1.09 (0.94, 1.26)
Socio-economic status
Most disadvantaged 3,144 293 9.3 1.00  
Disadvantaged 3,017 254 8.4 0.90 (0.77, 1.06)  
Average 2,997 263 8.8 0.94 (0.80, 1.10)  
Advantaged 3,341 259 7.8 0.83 (0.71, 0.98)  
Most advantaged 4,596 386 8.4 0.90 (0.78, 1.04)  
Smoking in pregnancy 1,561 176 11.3 1.37 (1.18, 1.59) 1.33 (1.14, 1.56)
No. of previous vaginal births
0 14,972 1,256 8.4 1.00 1.00
1 1,394 133 9.5 1.14 (0.96, 1.35) 0.94 (0.80-1.12)
≥2 531 53 10.0 1.19 (0.92, 1.54) 0.89 (0.68-1.15)
No. of previous CS
1 12,562 1,013 8.1 1.00 1.00
2 3,673 358 9.8 1.21 (1.07, 1.35) 1.16 (1.04, 1.30)
≥3 703 73 10.4 1.28 (1.03, 1.61) 1.16 (0.92, 1.45)
Prior delivery history c
Spontaneous preterm 402 102 25.4 4.31 (3.57, 5.20) 4.12 (3.38, 5.03)
Planned preterm 447 65 14.5 2.49 (1.96, 3.16) 2.47 (1.94, 3.14)
Spontaneous term 5,255 570 10.8 1.85 (1.65, 2.08) 1.85 (1.65, 2.07)
Planned term 8,722 512 5.9 1.00 1.00
Unavailable 2,488 224 9.0 1.54 (1.32, 1.79) 1.39 (1.19, 1.63)
Vertex Presentation 16,911 1,440 8.5 1.04 (0.75, 1.45)  
Size at birth
<10th percentile 903 81 9.0 1.03 (0.83, 1.27)  
10th - 90th percentile 13,674 1,194 8.7 1.00  
>90th percentile 2,729 197 7.2 0.83 (0.72, 0.96)  
Care type (private) 8,324 700 8.4 0.98 (0.89, 1.08)  
Antenatal care (<20w) 16,353 1,390 8.5 0.98 (0.80, 1.22)  
Birth hospital type
Private 6,597 533 8.1 0.96 (0.85, 1.08)  
Tertiary 5,743 483 8.4 1.00  
Other (urban) 2,409 225 9.3 1.11 (0.96, 1.29)  
Other (rural) 2,565 232 9.0 1.08 (0.93, 1.25)  
  1. aUnadjusted rate of spontaneous labour <39 weeks for each characteristic.
  2. bAdjusted for other variables in the column.
  3. cIncorporates spontaneous onset of labour or planned delivery (by labour induction or prelabour caesarean section) for the lowest gestation of all prior births.