A 2 × 2 table showing the correlation between the office-based scan and the criterion standard scan: No true positives were missed by the office-based scan, and no false positives were identified.
| ULTRASOUND OF AORTA FOR MAXIMAL AORTIC DIAMETER > 3 CM* | CRITERION STANDARD SCAN | ||
|---|---|---|---|
| POSITIVE FOR AAA, N | NEGATIVE FOR AAA, N | ||
| OFFICE-BASED SCAN | POSITIVE FOR AAA, N | 2 | 0 |
| NEGATIVE FOR AAA, N | 0 | 43 | |
AAA—abdominal aortic aneurysm.
↵* An AAA was defined as a focal dilatation of the aorta > 3 cm.