Table 1.

Age and sex comparison between 2001 Census and NWAHCS

	ABS 2001 Census		NWAHCS
			Unweighted				Weighted
	n	%	n	%	Chi-square value	P value	n	%	Chi-square value	P value
Sex					1.54	0.21			0.23	0.64
Male	159919	48.5	1930	47.5			1985	48.9
Female	169695	51.5	2130	52.5			2075	51.1
Age group					373.13	<0.001			5.14	0.40
18 to 29 years	70665	21.4	467	11.5*			899	21.4
30 to 39 years	66747	20.3	676	16.7*			790	20.3
40 to 49 years	61669	18.7	876	21.6*			785	18.7
50 to 59 years	49003	14.9	795	19.6*			600	14.9
60 to 69 years	35300	10.7	622	15.3*			448	10.7
70 years and over	46230	14.0	624	15.4*			538	14.0
Area of residence					2.32	0.13			1.69	0.19
Western Suburbs	182706	55.4	2299	56.6			2209	54.4
Northern Suburbs	146908	44.6	1761	43.4			1851	45.6
Total	329614	100.0	4060	100.0			4060	100.0

* denotes the category was statistically significantly different compared with ABS Census 2001 using adjusted standardized residuals greater than 2.0 and less than -2.0 (χ² test)