A telephone survey of factors affecting willingness to participate in health research surveys

BMC Public Health

Table 2 Demographic characteristics of participants

	Australian population % (ABS data) [20–24]	General population sample % n = 1559	Case-control study sample % n = 153	Cohort study sample % n = 401
	Aged ≥18
Male^a	49	42	61	94
Female	51	58	39	6
Age^a 18–39 years	40	28	0	1
40–60 years	34	41	13	39
>60 years	26	31	87	60
ATSI:^ab Yes	2.5	1	2	1
No	97.5	99	98	99
Country of birth^a
Australia	73	77	70	75
Other	27	23	30	25
Highest level of education^a	25–64 years only
School	41	42	49	46
Technical/trade certificate	35	22	30	32
Tertiary	24	35	21	22
Other	-	1	0	0
Remoteness index^a
Metropolitan	69	56	61	68
Inner regional	20	22	28	24
Outer regional/Remote	12	21	10	8
SEIFA Relative Disadvantage^ac
Quintile 1 least advantaged	20	14	2	10
Quintile 2	20	20	13	18
Quintile 3	20	22	27	18
Quintile 4	20	19	22	24
Quintile 5 most advantaged	20	25	36	30
Previously done health survey Yes		26	100	100
No		74	0	0
Previously refused health survey Yes		11	8	10
No refusal		89	92	90
Long-term disease/disability Yes		25	43	30
No		75	56	71

^aChi squared test p < 0.05 of comparison between the Australian population (column 2) and the general population sample (column3)
^bAboriginal or Torres Strait Islander
^cSEIFA, Socio-Economic Indexes for Areas is an aggregate score of relative socio-economic disadvantage; the lower the score the higher the relative disadvantage

ISSN: 1471-2458