Table 2. Overview of the randomized studies of ultrasound screening for abdominal aortic aneurysms (AAA) (1).

	MASS (UK)	Western Australia	Viborg (Denmark)	Chichester (UK), men	Chichester (UK), women
Age (years)	65–74	65–83	65–73	65–80	65–80
Sex	Men	Men	Men	Men	Women
Randomized	67 800	38 704	12 658	6433	9342
Follow-up (years)	7	3.6	9.6	15	5
Screening achieved	80%	63%	77%	73%	65%
Prevalence of AAA >3 cm	4.9%	7.2%	4.0%	7.6%	1.3%