Table 1.
Sample characteristics
| Full sample (N = 643,287) | Only amputation subsample (n = 68,633) | |||
|---|---|---|---|---|
| Variable | Mean (SD) | Range | Mean (SD) | Range |
| HCC score | 2.4 (1.8) | 0–17.9 | 2.5 (1.9) | 0–17.9 |
| Age (years) | 74.0 (12.3) | 18–114 | 67.7 (12.4) | 21–106 |
| National ADI (weighted) | 50.0 (20.2) | 0–98.7 | 52.3 (19.9) | 3.0–98.1 |
| No. (%) | No. (%) | |||
| Sex | ||||
| Male | 344,555 (53.6) | 45,930 (66.9) | ||
| Female | 298,732 (46.4) | 22,703 (33.1) | ||
| Race/ethnicity | ||||
| Non-Hispanic/White | 515,412 (80.1) | 47,460 (69.2) | ||
| Black/AA | 87,215 (13.6) | 15,272 (22.3) | ||
| Asian | 7,139 (1.1) | 898 (1.3) | ||
| Hispanic | 16,744 (2.6) | 2,589 (3.8) | ||
| Native American | 6,735 (1.0) | 608 (0.9) | ||
| Other | 6,517 (1.0) | 1,318 (1.9) | ||
| Unknown | 3,525 (0.6) | 488 (0.7) | ||
| Death | ||||
| Yes | 323,670 (50.3) | 28,838 (42.0) | ||
| No | 319,617 (49.7) | 39,795 (58.0) | ||
| Timing of LLA | ||||
| LLA <1 year | 37,442 (5.8) | 42,616 (63.1) | ||
| LLA 1–3 years | 17,172 (2.7) | 15,065 (22.3) | ||
| LLA ≥3 years | 14,019 (2.2) | 9,866 (14.6) | ||
| No LLA | 574,654 (89.3) | — | ||
| Comorbidities | ||||
| Chronic kidney disease | 136,107 (21.2) | 7,053 (10.3) | ||
| Peripheral vascular disease | 185,216 (28.8) | 5,285 (7.7) | ||
| Stroke/TIA | 506,576 (78.8) | 50,803 (74.0) | ||
| Heart disease | 101,921 (15.8) | 7,547 (11.0) | ||
| Acute myocardial infarction | 575,946 (89.5) | 57,257 (83.4) | ||