Table 7. Profile^a of Non-participants^a versus participants.

		Non-participants (N = 5,617)a	Participants (N = 11,433)a	p-value
Gender	Male	2,808 (50.0%)	5,616 (49.1%)	0.29
	Female	2,809 (50.0%)	5,817 (50.9%)
Age category	18–24 years	497 (8.8%)	1,042 (9.1%)	0.0061
	25–34 years	880 (15.7%)	1,636 (14.3%)
	35–49 years	1,233 (22.0%)	2,577 (22.5%)
	50–64 years	1,343 (23.9%)	2,961 (25.9%)
	65 years & over	1,664 (29.6%)	3,217 (28.1%)
Household location b	VIC	1,401 (24.9%)	2,758 (24.1%)	< .001
	NSW/ACT	1,814 (32.3%)	3,894 (34.1%)
	QLD	1,166 (20.8%)	2,230 (19.5%)
	SA	503 (9.0%)	926 (8.1%)
	WA	508 (9.0%)	1,262 (11.0%)
	NT/TAS	225 (4.0%)	363 (3.2%)

^a PARTICIPANTS: Approached Australian residents aged ≥18yo who agreed to answer the HS questionnaire. NON-PARTICIPANTS: Individuals interviewed by Roy Morgan Research who refused to answer the HS questionnaire.

^b VIC = Victoria, NSW = New South Wales, ACT = Australian Capital Territory, QLD = Queensland, SA = South Australia, WA = Western Australia, NT = Northern Territory and TAS = Tasmania.