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Table 4 Tocolysis regression results

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

Model   Complete population Steroids-only population
   N OR 95% CI P-valuea N OR 95% CI P-valuea
Condition at birth         
  Baseline 1720 2.25 (1.75 – 2.90) <0.0001 1213 1.44 (1.08 – 1.95) 0.0138
  Baseline + GAb 1720 1.64 (1.24 – 2.18) <0.0001 1213 1.53 (1.12 – 2.09) <0.0001
  Clinicalc 1655 1.37 (1.01 – 1.87) <0.0001 1205 1.42 (1.04 – 1.96) <0.0001
  Counsellingd 1655 1.45 (1.05 – 2.00) <0.0001 1205 1.47 (1.06 – 2.04) <0.0001
Delivery Room death         
  Baseline 1720 0.33 (0.24 – 0.44) <0.0001 1213 0.53 (0.36 – 0.76) 0.0005
  Baseline + GAb 1720 0.46 (0.32 – 0.65) <0.0001 1213 0.47 (0.31 – 0.70) <0.0001
  Clinicalc 1655 0.58 (0.39 – 0.84) <0.0001 1211 0.49 (0.32 – 0.73) <0.0001
  Counsellingd 1655 0.48 (0.32 – 0.73) <0.0001 1211 0.43 (0.28 – 0.66) <0.0001
  1. Odds ratios of the effect of tocolysis 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, and the restricted population of those babies born to women who received antenatal steroids
  2. aLikelihood ratio test p-value comparing model against next simplest model
  3. bGA: gestational age
  4. cThe clinical models for condition at birth and delivery room death were adjusted for: provision of antenatal steroids, NICU level at birth, in utero transfer and presence of placental abruption
  5. dIn addition to the factors adjusted for in the clinical models, the complete models were also adjusted for who counselling was provided by, whether and what choice was expressed for resuscitation, and whether a decision was made to not perform Caesarean section in the presence of fetal distress