Table 2.

Prediction model for probability of successful induction of labour

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]