Under-reporting of birth registrations in New South Wales, Australia

Xu, Fenglian; Sullivan, Elizabeth A; Black, Deborah A; Jackson Pulver, Lisa R; Madden, Richard C

doi:10.1186/1471-2393-12-147

BMC Pregnancy and Childbirth

Table 2 Rates and crude odds ratio for factors associated with non-registration, New South Wales, Australia, 2001–2005 (n = 427,073)

From: Under-reporting of birth registrations in New South Wales, Australia

			Registered		Non-registered
		n	n1	%	n2	%	Crude OR^a	95% CI
Indigenous status*	Indigenous	14,055	10,023	71.31	4,032	28.69	4.96	4.77	5.16
	Non- indigenous	413,009	382,031	92.50	30,978	7.50	1
	Missing	9	2	22.22	7	77.78
	Total	427,073	392,056	91.80	35,017	8.20
Maternal age*	25–39	332,866	310,270	93.21	22,596	6.79	1
	<25 or >39	94,193	81,786	86.83	12,407	13.17	2.08	2.04	2.13
	Total	427,059	392,056	91.80	35,003	8.20
Birthweight (grams)*	≥2500g	401,750	370,078	92.12	31,672	7.88	1
	<2500g	25,310	21,973	86.82	3,337	13.18	1.78	1.71	1.84
	Missing	13	5	38.46	8	61.54
	Total	427,073	392,056	91.80	35,017	8.20
Plurality	Singleton	413,464	379,569	91.80	33,895	8.20	1
	Multiple	13,609	12,487	91.76	1,122	8.24	1.01	0.95	1.07
	Total	427,073	392,056	91.80	35,017	8.20
Quarters*^b	First	105,448	99,499	94.36	5,949	5.64	1
	Second	105,777	99,522	94.09	6,255	5.91	1.05	1.01	1.09
	Third	109,978	102,812	93.48	7,166	6.52	1.17	1.13	1.21
	Fourth	83,746	78,118	93.28	5,628	6.72	1.20	1.16	1.25
	Total	404,949	379,951	93.83	24,998	6.17
Number of previous pregnancies*	0	178,720	168,657	94.37	10,063	5.63	1
	1	143,915	132,948	92.38	10,967	7.62	1.38	1.34	1.42
	2	65,243	58,267	89.31	6,976	10.69	2.01	1.94	2.07
	3	23,702	20,087	84.75	3,615	15.25	3.02	2.90	3.14
	4+	15,215	11,841	77.82	3,374	22.18	4.78	4.57	4.99
	Missing	278	256	92.09	22	7.91
	Total	427,073	392,056	91.80	35,017	8.20
Remoteness*	Major cities	321,503	299,357	93.11	22,146	6.89	1
	Other areas	105,570	92,699	87.81	12,871	12.19	1.88	1.83	1.92
	Total	427,073	392,056	91.80	35,017	8.20
Mother’s country of birth*	Australia	301,335	278,314	92.36	23,021	7.64	1
	Other countries	119,776	113,700	94.93	6,076	5.07	0.65	0.63	0.67
	Missing^c	5,962	42	0.70	5,920	99.30
	Total	427,073	392,056	91.80	35,017	8.20
Neonatal or postneonatal death	No	425,870	391,172	91.85	34,698	8.15	1
	Yes	1,203	884	73.48	319	26.52	4.07	3.58	4.62
	Total	427,073	392,056	91.80	35,017	8.20
Year of birth	2001	84,470	79,796	94.47	4,674	5.53	1
	2002	84,609	80,141	94.72	4,468	5.28	0.95	0.91	0.99
	2003	85,000	79,949	94.06	5,051	5.94	1.08	1.03	1.12
	2004	84,095	78733	93.62	5,362	6.38	1.16	1.12	1.21
	2005	88,899	73,437	82.61	15,462	17.39	3.59	3.47	3.72
	Total	427,073	392,056	91.80	35,017	8.20

^a Crude odds ratio (OR).
* Crude odds ratio is significantly different.
^b The data from October to December 2005 were excluded because of the interval between birth and registration.
^c The missing records of mother’s country of birth were mainly missing from the MDC in 2001 and 2002.

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ISSN: 1471-2393

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