Do people with risky behaviours participate in biomedical cohort studies?

BMC Public Health

Table 2 SEIFA Index of relative socio-economic disadvantage – comparison between 2001 Census and NWAHCS

	ABS 2001 Census		NWAHCS weighted		Chi-square value	P value
	n	%	n	%
2001 SEIFA Index of Relative Socio-economic Disadvantage – quintile					23.59	<0.001
Lowest quintile	124457	37.8	1504	37.0
2nd quintile	65806	20.0	842	20.7
3rd quintile	88351	26.8	1174	28.9		*
4th quintile	43479	13.2	445	11.0		*
Highest quintile	7521	2.3	94	2.3
Total	329614	100.0	4060	100.0

Note: Quintiles are based on NW Adelaide population, 18+ years
* 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)

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