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Table 2 Prediction model for probability of successful induction of labour

From: Derivation and validation of a model predicting the likelihood of vaginal birth following labour induction

Variable β-Coefficient Standard Error p Value
  (Intercept) 0.82 0.10 < 0.001
a Parity (Multiparous) 1.79 0.22 < 0.001
b Weight, pre-pregnancy (kg) 61.21 11.84 < 0.001
(Weight, pre-pregnancy)2 −12.45 7.35 0.09
(Weight, pre-pregnancy)3 −6.48 5.07 0.20
c BMI, pre-pregnancy (kg/m2) −57.98 8.56 < 0.001
(BMI, pre-pregnancy)2 9.42 5.90 0.11
(BMI, pre-pregnancy)3 12.68 5.04 0.01
d Gestational Age (weeks) −6.01 2.66 0.02
(Gestational Age)2 −3.41 2.49 0.17
(Gestational Age)3 4.52 2.47 0.07
e Weight, at-delivery (kg) −13.97 7.62 0.07
(Weight, at-delivery)2 7.79 4.90 0.11
f Dilation (cm) 23.57 3.98 < 0.001
(Dilation)2 4.97 3.87 0.20
g Maternal Age (years) −8.43 2.57 < 0.001
(Maternal Age)2 −4.35 2.34 0.06
Equation Risk Score = 0.82 + [1.79 x a] + [61.21 x b] - [12.45 x b2] - [6.48 x b3] - [57.98 x c] + [9.42 x c2] + [12.68 x c3] - [6.01 x d] - [3.41 x d2] + [4.52 x d3] - [13.97 x e] + [7.79 x e2] + [23.57 x f] + [4.97 x f2] – [8.43 x g] – [4.35 x g2]; probability of vaginal delivery = 1/(1 + e-Risk Score)
Model Performance Hosmer-Lemeshow goodness-of-fit χ2 = 5.02, 8 degrees of freedom, p = 0.76 Area under receiver operating characteristic curve 0.81 [95% CI 0.78–0.83]