Table 2. Multinomial logistic regression: significant predictors of group membership.

Groups	Predictor	B	SE	Wald χ2	df	p	Exp(B)	95% CI for Exp(B)
Group 1	Gestational age	5.146	1.124	20.96	1	<.001	171.76	[18.97–1554.86]
	Parity	–4.533	2.086	4.72	1	.030	0.01	[0.00–0.64]
	Previous caesarean section (yes)	–12.35	1.933	40.82	1	< .001	0.00	[0.00–0.00]
	Mode of onset of labour (Spont.)	3.047	0.733	17.29	1	< .001	21.05	[5.01–88.51]
Group 2	Gestational age	4.780	1.149	17.30	1	< .001	119.08	[12.51–1132.77]
	Parity	–3.884	1.881	4.264	1	.039	.021	[.001–.821]
	Previous caesarean section (yes)	–14.590	1.765	68.30	1	< .001	4.6E-7	[1.44E-8–1.47E-5]
Group 3	Gestational age	5.322	1.192	19.93	1	< .001	204.70	[19.79–2117.10]
	Previous caesarean section (yes)	–11.234	1.337	70.63	1	< .001	1.32E-5	[9.62E-7–.000]
	Mode of onset of labour (Spont.)	3.212	.777	17.08	1	< .001	24.83	[5.41–113.90]
Group 4	Gestational age	5.046	1.262	15.98	1	< .001	155.43	[13.09–1845.14]
	Previous caesarean section (yes)	–14.885	1.316	127.99	1	< .001	3.43E-7	[2.60E-8–4.52E-6]
	Hypertensive disorders of pregnancy	4.185	1.950	4.61	1	.032	65.70	[1.44–3000.30]
Group 5	Gestational age	4.952	.514	92.66	1	< .001	141.48	[51.62–387.79]
	APH/major placenta previa	–2.217	.937	5.60	1	.018	.11	[.017–.684]
Group 6	Gestational age	3.616	1.092	10.98	1	< .001	37.20	[4.38–316.02]
	Parity	–6.138	1.990	9.51	1	.002	.002	[4.37E-5–.107]
	Previous caesarean section (yes)	–12.897	1.802	51.21	1	< .001	2.51E-6	[7.32E-8–8.57E-5]
Group 7	Gestational age	4.318	1.135	14.48	1	< .001	75.06	[8.12–694.03]
	Previous caesarean section (yes)	–12.877	1.780	52.32	1	< .001	2.56E-6	[7.80E-8–8.37E-5]
Group 9	Presentation	–210.497	29.139	52.19	1	< .001	3.82E-92	[6.02E-117–2.43E-67