| Viborg | MASS | Chichester | Perth | |
|---|---|---|---|---|
| Study, year | Lindholt, 1995 (13) | Ashton, 2002 (17) | Scott, 1995 (16) | Norman, 2004 (15) |
| Recruitment | ||||
| Study design | RCT | RCT | RCT | RCT |
| Location | Denmark | United Kingdom | United Kingdom | Australia |
| Sex | Men | Men | Men and Women | Men |
| Age, years | 65–73 | 65–74 | 65–80 | 65–83 |
| Sample size | 12,639 | 67,800 | 15,775 | 41,000 |
| Randomized | ||||
| Randomization | Individual | Individual | Individual | Individual |
| Invited to screening | 6333 | 33839 | 7887 | 19352 |
| Accepted screening, % | 76 | 80 | 68 | 63 |
| Uninvited controls | 6,319 | 33,961 | 7,888 | 19,352 |
| Groups similar at baseline | Yes | Yes | Yes | Yes |
| Outcome Ascertainment | ||||
| Blinded assessors | Yes | No | No | Yes |
| Death registry | Yes | Yes | Yes | Yes |
| Hospital records | Yes | Yes | Yes | Yes |
| Outcome ascertainment, % | 100 | 99 | NR | NR |
| Analysis | ||||
| Sufficient sample size | Yes | Yes | No | Yes |
| Intention to treat analysis | Yes | Yes | Yes | |
| Follow-up (years) | 5 | 4 | 5,10 | 5 |
| Appropriate statistical analysis | Yes | Yes | Yes | Yes |
| Quality | Good | Good | Fair | Fair–Good |
*
AAA indicates abdominal aortic aneurysm; RCT, randomized controlled trial; NR, not reported