Randomized controlled trials on outcomes of screening men aged 65 years and older for AAA with ultrasonography
| Study | Location | Sample size | Intervention/control | Mean length of follow-up, yr |
|---|---|---|---|---|
| Multicentre Aneurysm Screening Study (MASS)17,29–31 | Four sites in England | n = 67 700 | Intervention, n = 33 883; Control, n = 33 887 | 13.1 |
| Chichester6,18,32,33 | England | n = 6433 | Intervention, n = 3228; Control, n = 3205 | 15 |
| Viborg16,35–37 | Denmark | n = 12 639 | Intervention, n = 6333; Control, n = 6306 | 14 |
| Western Australia15,34,38 | Australia | n = 38 704 | Intervention, n = 19 249; Control, n = 19 231 | 12.8 |
Note: AAA = abdominal aortic aneurysm.