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Table 5 Delivery regression results

From: Impact of obstetric interventions on condition at birth in extremely preterm babies: evidence from a national cohort study

Model   N ≤24 weeks 25 weeks 26 weeks P-valuea
    OR (95% CI) OR (95% CI) OR (95% CI)  
Condition at birth         
  Baseline 1717 3.89 (2.00 – 7.58) 1.85 (1.02 – 3.34) 1.22 (0.69 – 2.18) 0.031
  Baseline: no labour 1712 13.5 (3.50 – 52.08) 4.13 (1.35 – 12.62) 0.98 (0.11 – 8.41) 0.018
  Baseline: spontaneous labour   1.79 (0.76 – 4.24) 1.95 (0.79 – 4.79) 0.75 (0.35 – 1.58)  
  Clinical: no labourb 1680 22.96 (5.19 – 101.52) 8.24 (2.49 – 27.33) 2.22 (0.24 – 20.16) 0.001
  Clinical: spontaneous labourb   1.18 (0.47 – 2.96) 2.01 (0.80 – 5.08) 0.71 (0.33 – 1.54)  
  Complete: no labourc 1680 12.67 (2.79 – 57.60) 4.94 (1.44 – 16.90) 1.56 (0.16 – 14.81) <0.001
  Complete: spontaneous labourc   0.95 (0.38 – 2.40) 1.58 (0.62 – 4.03) 0.70 (0.32 – 1.52)  
Delivery room death         
  Baseline 1717 0.24 (0.12 – 0.50) 0.79 (0.39 – 1.63) 0.63 (0.24 – 1.70) 0.055
  Baseline: no labour 1712 0.05 (0.01 – 0.23) 0.20 (0.06 – 0.67) 0.39 (0.04 – 3.76) 0.019
  Baseline: spontaneous labour   0.56 (0.23 – 1.35) 0.82 (0.27 – 2.44) 0.65 (0.14 – 2.97)  
  Clinical: no labourb 1680 0.01 (0.00 – 0.09) 0.06 (0.02 – 0.25) 0.09 (0.01 – 1.03) <0.001
  Clinical: spontaneous labourb   0.96 (0.36 – 2.55) 0.77 (0.25 – 2.43) 0.63 (0.13 – 3.00)  
  Complete: no labourc 1680 0.03 (0.01 – 0.21) 0.13 (0.03 – 0.55) 0.12 (0.01 – 1.63) <0.001
  Complete: spontaneous labourc   1.36 (0.50 – 3.70) 1.07 (0.33 – 3.46) 0.63 (0.13 – 3.00)  
  1. Odds ratios of the effect of delivery by caesaerean section on the presence of a heart rate greater than 100 at minutes of age or to delivery room death in the complete population of babies born at 22–26 completed weeks of gestation in England in 2006 who were known to be alive at admission to hospital and at the start of labour monitoring or delivery to perform Caesarean section
  2. aLikelihood ratio test comparing model against next simplest model
  3. bThe clinical models were additionally adjusted for: antenatal steroids, in utero transfer, maternal pre-eclampsia and placental abruption
  4. cThe complete models were adjusted for the same factors as the clinical models, plus: who the parents were counselled by, whether a decision was made not to perform Caesarean section in cases of fetal distress, what choice was expressed for resuscitation, and whether withholding care was discussed