Late entry to antenatal care in New South Wales, Australia

Table 3 Reduced regression models of pregnancy durationat entry to ANC, N = 83,034

Variables	Logistic regression#
	OR	*95% CI*		*P>z*
PREDISPOSING CHARACTERISTICS
*Age*
Teens	2.99	2.76	3.23	<0.001
Twenties	1.59	1.54	1.64	<0.001
Thirties (reference)
Forties and fifties	0.91	0.84	0.99	0.022
Missing	0.66	0.18	2.44	0.536
*Race/Origin*
Non Aboriginal Australian born (reference)
Aboriginal and Torres Strait Islanders	1.55	1.42	1.71	<0.001
Migrants from developed countries	1.47	1.39	1.56	<0.001
Migrants from developing countries	2.18	2.10	2.26	<0.001
Missing	2.12	1.57	2.86	<0.001
ENABLING
*Residence*
Eastern Sydney (reference)
Western Sydney	1.57	1.51	1.63	<0.001
Regional NSW	0.76	0.73	0.80	<0.001
Rural/Remote NSW	0.41	0.39	0.43	<0.001
Others states	0.84	0.76	0.92	<0.001
NEEDS
*Number of previous pregnancies*
Zero (reference)
One	1.12	1.08	1.16	<0.001
Two	1.38	1.32	1.44	<0.001
Three or more	2.17	2.05	2.30	<0.001
Missing	1.90	0.93	3.92	0.080
*Last caesarean delivery*
No (reference)
Yes	0.76	0.73	0.80	<0.001
Missing	0.83	0.51	1.35	0.458
*Number of foetuses*
Singleton (reference)
Twins Triplets or quadruplets	0.86	0.79	0.94	0.001
HEALTH BEHAVIOUR
*Number of cigarettes per day*
Non (reference)
Ten or less	1.39	1.32	1.47	<0.001
More than ten	1.85	1.74	1.96	<0.001
Missing	1.51	1.18	1.92	0.001
Constat	-	-	-	-
Model Chi square (df)(p)	8729 (22) (<0.001)
Model F test (df) (p)

# Outcome was either entered ANC early (within 12 weeks) or late (after 12 weeks)

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