Table 1.
Preoperative characteristics.
| Characteristics | Low-volume surgeon (n = 453) Number of cases (%) |
High-volume surgeon (n = 321) Number of cases (%) |
P value |
|---|---|---|---|
| Gender | |||
| Male | 234 (52) | 184 (57) | 0.12 |
| Female | 219 (48) | 137 (43) | |
|
| |||
| Age in years | |||
| Median (95% CI)e | 69 (46–92) | 69 (48–90) | |
| <50 | 30 (7) | 11 (3) | 0.66 |
| 50–75 | 276 (61) | 218 (68) | |
| >75 | 147 (32) | 92 (29) | |
|
| |||
| ASAa-classification [16] | |||
| 1 | 101 (23) | 57 (18) | <0.001 |
| 2 | 218 (47) | 192 (60) | |
| 3 | 112 (25) | 69 (21) | |
| 4 | 22 (5) | 3 (1) | |
|
| |||
| Comorbidity | |||
| No | 147 (33) | 102 (32) | 0.83 |
| Yes | 305 (67) | 219 (68) | |
| Cardiac | |||
| No | 367 (81) | 251 (78) | 0.30 |
| Yes | 85 (19) | 70 (22) | |
| Pulmonary | |||
| No | 411 (91) | 285 (89) | 0.33 |
| Yes | 41 (9) | 36 (11) | |
| Diabetes | |||
| No | 393 (87) | 293 (91) | 0.06 |
| Yes | 59 (13) | 28 (9) | |
|
| |||
| BMIb | |||
| Median (95% CI)e | 26 (18.5–32.5) | 26 (18.7–32.7) | 0.54 |
|
| |||
| Surgical technique | |||
| Open | 187 (41) | 72 (22) | <0.001 |
| Laparoscopic | 266 (59) | 249 (78) | |
|
| |||
| Type of resection | |||
| Right colon | 149 (33) | 86 (27) | <0.001 |
| Transversum | 26 (6) | 6 (2) | |
| Left colon | 49 (11) | 29 (9) | |
| Sigmoid | 109 (24) | 95 (29) | |
| LARc | 95 (21) | 70 (22) | |
| APRd | 25 (5) | 35 (11) | |
|
| |||
| Neoadjuvant radiotherapy (rectum only) | |||
| No | 74 (56) | 52 (45) | 0.10 |
| Yes | 59 (44) | 63 (55) | |
|
| |||
| Neoadjuvant chemoradiotherapy (rectum only) | |||
| No | 130 (98) | 90 (78) | <0.001 |
| Yes | 3 (2) | 25 (22) | |
aAmerican Society of Anesthesiology; bbody mass index; clow anterior resection; dabdominoperineal resection; e95% confidence interval.