Screening for Abdominal Aortic Aneurysm: Evidence Systematic Review: Table 1

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Table 1. Characteristics of Screening Trials for Abdominal Aortic Aneurysm.¹

Characteristic	MASS²²	Western Australia Study^23,32	Viborg County Study²¹	Chichester Study, Men²⁰	Chichester Study, Women²⁰
Location	United Kingdom	Australia	Denmark	United Kingdom	United Kingdom
Age, y	65–74	65–83	65–73	65–80	65–80
Total patients randomly assigned to treatment, n	67,800	38,704	12,658	6433	9342
Mean followup, y	4.1	3.6²	5.1	2.5	2.6
Invited for screening, n	33,839	19,352	6339	3205	4682
Attended screening, %	80	63	69	73	65
Uninvited controls, n	33,961	19,352	6319	3228	4660
Outcomes ascertained, %	99	99³	100	NR	NR
Quality	Good	Fair	Fair	Fair	Fair

^1. Values in parentheses are reference numbers. All studies except the Chichester study included only men. MASS= Multicentre Aneurysm Screening Study; NR= not reported.
^2. Median followup.
^3. Provided by the study investigators.

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Table 1. Characteristics of Screening Trials for Abdominal Aortic Aneurysm.1

Table 1. Characteristics of Screening Trials for Abdominal Aortic Aneurysm.¹