Table 2.

Use of Arterial Testing Before Amputation by Location of Amputation

TestLocation of Amputation, n (%)P Value*
All Patients (N=17 463)Foot (n=7343)Below Knee (n=4804)Above Knee (n=5316)
Any arterial testing11 945 (68.4)4589 (62.5)3686 (76.7)3670 (69.0)<0.001
 Ankle-brachial index8293 (47.5)3386 (46.1)2542 (52.9)2365 (44.5)<0.001
 Duplex ultrasound5426 (31.1)1959 (26.7)1675 (34.9)1792 (33.7)<0.001
 Computed tomographic angiography1169 (6.7)406 (5.5)364 (7.6)399 (7.5)<0.001
 Magnetic resonance angiography974 (5.6)391 (5.3)342 (7.1)241 (4.5)<0.001
 Invasive angiography6750 (38.7)2500 (34.0)2362 (49.2)1888 (35.5)<0.001
Any arterial testing in the previous 2 y12 512 (71.6)4853 (66.1)3820 (79.5)3839 (72.2)<0.001
  • * We tested for differences in patient characteristics by location (foot, below the knee, or above the knee) using χ2 tests.