Table 1.
Differences in patient and dialysis facility characteristics between quartiles of vascular surgeon supply across Hospital Service Areas (N = 100,227)
| Variable | Quartiles of surgeon supply (number of surgeons/1000 patients) |
|||
|---|---|---|---|---|
| First (<8.6) | Second (8.6 to <10.6) | Third (10.6–<13.6) | Fourth (≥13.6) | |
| Median [IQR] number of AVF creations per surgeon | 11.3 [8.7–15.6] | 10.2 [9.2–12.0] | 8.0 [7.3–9.2] | 6.5 [5.5–7.8] |
| Age (yr) | ||||
| <45 | 11.6 | 12.3 | 11.2 | 10.6 |
| 45 to <65 | 39.7 | 39.5 | 36.9 | 34.8 |
| 65 to <80 | 36.4 | 35.9 | 37.7 | 39.7 |
| 80+ | 12.3 | 12.2 | 14.1 | 14.9 |
| Male sex | 56.2 | 56.8 | 56.4 | 57.8 |
| Black race | 31.6 | 30.0 | 31.9 | 24.1 |
| Primary cause of kidney failure | ||||
| Diabetes | 51.1 | 50.2 | 47.1 | 47.2 |
| Hypertension | 32.5 | 32.3 | 33.0 | 29.4 |
| Glomerulonephritis | 5.7 | 6.1 | 6.9 | 8.2 |
| Insurance | ||||
| Medicaid | 32.5 | 27.8 | 27.0 | 25.0 |
| Medicare | 45.8 | 47.5 | 51.9 | 54.8 |
| Private employer group health insurance | 9.8 | 10.8 | 10.2 | 10.8 |
| Uninsured | 5.7 | 7.4 | 5.0 | 3.2 |
| Predialysis nephrology care | 51.1 | 52.1 | 54.3 | 57.3 |
| BMI, mean (SD), kg/m2 | 29.9 (8.2) | 29.8 (8.1) | 29.9 (8.2) | 29.8 (8.2) |
| Coronary artery disease | 11.4 | 11.6 | 13.9 | 16.7 |
| Congestive heart failure | 32.5 | 30.3 | 33.7 | 33.7 |
| Diabetes mellitus | 44.5 | 44.2 | 43.1 | 43.8 |
| Hypertension | 88.0 | 87.9 | 87.9 | 87.1 |
| Transient ischemic attack | 8.9 | 8.4 | 9.8 | 9.8 |
| Peripheral vascular disease | 9.6 | 8.9 | 10.4 | 11.7 |
| Drug/alcohol use | 3.0 | 2.8 | 3.3 | 3.4 |
| Institutionalized | 9.2 | 8.6 | 11.1 | 11.7 |
| Needs assistance with daily activities | 15.2 | 14.6 | 16.2 | 16.0 |
| Dialysis chain affiliation | ||||
| DaVita | 36.2 | 35.8 | 34.1 | 32.1 |
| Fresenius | 34.6 | 40.1 | 39.1 | 34.9 |
| Midsized | 15.4 | 12.0 | 11.1 | 13.3 |
| Small/nonchain | 13.8 | 12.1 | 15.7 | 19.7 |
| Freestanding (nonhospital-based) facilities | 96.1 | 97.8 | 94.7 | 92.7 |
| For-profit facilities | 90.4 | 93.1 | 89.0 | 84.1 |
| Dialysis facility size (number of patient), mean (SD) | 108 (64) | 98 (57) | 94 (55) | 87 (51) |
| Geographic regiona | ||||
| Northeast (networks 1–5) | 9.9 | 9.4 | 29.3 | 33.9 |
| Southeast (networks 6–8, 13, 14) | 35.2 | 52.4 | 36.2 | 30.8 |
| Midwest (networks 9–12) | 23.0 | 15.9 | 25.4 | 26.6 |
| West (networks 15–18) | 31.9 | 22.2 | 9.1 | 8.7 |
BMI, body mass index; CO, Colorado; FL, Florida; IL, Illinois; IN, Indiana; IQR, interquartile range; MN, Minnesota; MO, Missouri; MS, Mississippi; NC, North Carolina; N-CA, North California; NJ, New Jersey; NY, New York; OK, Oklahoma; PA, Pennsylvania; S-CA, South California; TX, Texas; WA, Washington.
a
Northeast includes New England, NY, NJ Trans-Atlantic, PA, and Mid Atlantic. Southeast includes NC, FL, MS, OK, and TX. Midwest includes IN tristate, IL, MN, and MO. West includes CO, WA, N-CA, and S-CA.