BMC Cardiovascular Disorders

Table 1 Participation rates for the overall sample and stratified for sex and age classes

From: Prevalence of abdominal aortic aneurysms and its relation with cardiovascular risk stratification: protocol of the Risk of Cardiovascular diseases and abdominal aortic Aneurysm in Varese (RoCAV) population based study

	Males			Females			Total
	Participants (N)	Invited (N)^b	Rate (%)	Participants (N)	Invited (N)^b	Rate (%)	Rate (%)
50-54^a	295	503	58.6	-	-	-	58.6
55–59	490	752	65.2	-	-	-	65.2
60–64	465	698	66.6	315	503	62.6	65.0
65–69	525	777	67.6	479	747	64.1	65.9
≥70^a	629	950	66.2	579	988	58.6	62.3
All	2404	3680	65.3	1373	2238	61.3	63.8

^aInvitation letters were sent during all the recruitment time, this caused a shift towards older classes
^bSubjects who did not receive the letter (changed address, death during recruitment; n = 249) were excluded

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ISSN: 1471-2261

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