Table 2.
Characteristics of all TSAs by surgeon volume group
| Variable | Low volume (n = 11,812) | Medium volume (n = 32,190) | High volume (n = 50,658) | Very high volume (n = 57,232) |
| Mean subsequent revision rate, % (n) | 4 (426) | 3 (1049) | 3 (1379) | 2 (1404) |
| Left shoulder, % (n) | 44 (5178) | 44 (14,247) | 43 (21,963) | 43 (24,828) |
| Age in years, mean ± SD | 72 ± 8 | 72 ± 7 | 73 ± 7 | 72 ± 7 |
| Female, % (n) | 61 (7211) | 60 (19,197) | 59 (30,007) | 57 (32,513) |
| White, % (n) | 90 (10,573) | 92 (29,653) | 93 (47,005) | 93 (53,277) |
| CMS-HCC risk score, mean ± SD | 1.2 ± 1.1 | 1.2 ± 1.0 | 1.1 ± 1.0 | 1.1 ± 1.0 |
| BMI > 40 kg/m2, % (n) | 6 (688) | 6 (1872) | 6 (2839) | 6 (3251) |
| CHF, % (n) | 6 (745) | 6 (2049) | 6 (3223) | 6 (3397) |
| COPD, % (n) | 13 (1497) | 12 (3985) | 11 (5588) | 10 (5687) |
| Cancer, % (n) | 1.5 (179) | 1.2 (399) | 1.2 (607) | 1.3 (772) |
| Diabetes, % (n) | 24 (2798) | 23 (7352) | 22 (10,953) | 20 (11,201) |
| Kidney disease, % (n) | 3 (347) | 3 (1015) | 3 (1392) | 3 (1554) |
| Liver disease, % (n) | 0.7 (85) | 0.6 (208) | 0.7 (330) | 0.5 (294) |
CMS-HCC = Centers for Medicare and Medicaid Services Hierarchical Condition Categories; CHF = congestive heart failure; COPD = chronic obstructive pulmonary disease.