Table 2.
Patient Demographics and Baseline Characteristics
| Surgeon volume category* |
||||
|---|---|---|---|---|
| Demographic and characteristics | Low (n = 3,916) | Medium (n = 7,038) | High (n = 6,795) | p Value |
| Age, y, mean (SD) | 66 (13.5) | 65 (13.7) | 65 (13.8) | NS |
|
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| Male, n (%) | 1,902 (49) | 3,445 (49) | 3,414 (50) | NS |
|
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| Race, n (%) | ||||
|
| ||||
| White | 2,808 (72) | 5,178 (74) | 4,989 (73) | NS |
|
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| Black | 539 (14) | 1,007 (14) | 817 (12) | <0.001 |
|
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| Hispanic | 36 (1) | 48 (1) | 23 (<1) | <0.001 |
|
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| Asian | 120 (3) | 205 (3) | 236 (3) | NS |
|
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| Other | 412 (8) | 600 (9) | 730 (11) | <0.001 |
|
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| Insurance status, n (%) | ||||
|
| ||||
| Private | 1,314 (33) | 2,706 (39) | 2,847 (42) | <0.001 |
|
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| Public | 2,380 (61) | 4,069 (58) | 3,780 (55) | <0.001 |
|
| ||||
| Self-pay | 24 (<1) | 51 (<1) | 45 (<1) | <0.001 |
|
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| Other | 198 (5) | 212 (3) | 123 (2) | <0.001 |
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| Comorbidities, n (%) | ||||
|
| ||||
| Hypertension | 2,197 (56) | 3,844 (54) | 3,634 (54) | 0.03 |
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| Diabetes | 847 (22) | 1,389 (20) | 1,300 (19) | 0.01 |
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| Anemia | 856 (22) | 1,448 (21) | 1,220 (18) | <0.001 |
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| COPD | 496 (13) | 844 (13) | 849 (13) | NS |
|
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| Obesity | 410 (10) | 788 (11) | 844 (12) | 0.01 |
|
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| Congestive heart failure | 214 (5) | 357 (5) | 331 (5) | NS |
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| Depression | 250 (6) | 472 (7) | 487 (7) | NS |
|
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| Renal disease | 222 (6) | 373 (5) | 408 (6) | NS |
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| Peripheral vascular disease | 177 (5) | 268 (4) | 271 (4) | NS |
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| Liver disease | 106 (3) | 174 (3) | 153 (2) | NS |
|
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| Severity of illness category, n (%) | ||||
|
| ||||
| Low (minor/moderate) | 3,533 (90) | 6,480 (92) | 6,216 (91) | 0.004 |
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| High (major/extreme) | 383 (10) | 558 (8) | 579 (9) | 0.004 |
*
Low, <5 colectomies per year; medium; 5—11 colectomies per year; high, >11 colectomies per year.