Table 1.
Demographics of patients stratified by hospital caseload, according to Henneman et al.
| Low volume (≤ 200 cases/year) (N = 14,246) |
High volume (> 200 cases/year) (N = 9,105) |
P-value | |
|---|---|---|---|
| Age in years | |||
| Mean (SD) | 72.0 (± 11.0) | 70.3 (± 11.7) | < 0.001 |
| Median [IQR] | 73 [66–80] | 72 [64–79] | < 0.001 |
| BMI | |||
| Mean (SD) | 26.2 (± 4.6) | 26.1 (± 4.7) | 0.175 |
| Median [IQR] | 26 [23–29] | 26 [23–29] | 0.085 |
| Missing, n (%) | 6026 (42.3) | 4151 (45.6) | |
| Sex, n (%) | 0.350 | ||
| Female | 6809 (47.8) | 4294 (47.2) | |
| Male | 7437 (52.2) | 4811 (52.8) | |
| ASA classification, n (%) | < 0.001 | ||
| 1 | 1624 (11.4) | 1035 (11.4) | |
| 2 | 7507 (52.7) | 4368 (48.0) | |
| 3 | 4380 (30.7) | 3213 (35.3) | |
| 4 | 348 (2.4) | 305 (3.3) | |
| 5 | 9 (0.1) | 6 (0.1) | |
| Missing | 378 (2.7) | 178 (2.0) | |
| Cancer stage, n (%) | < 0.001 | ||
| 1 | 3047 (21.4) | 1858 (20.4) | |
| 2 | 4895 (34.4) | 2888 (31.7) | |
| 3 | 4778 (33.5) | 3203 (35.2) | |
| 4 | 1038 (7.3) | 734 (8.1) | |
| Missing | 488 (3.4) | 422 (4.6) | |
| Tumor location, n (%) | < 0.001 | ||
| Colon | 10561 (74.1) | 6382 (70.1) | |
| Rectum | 3685 (25.9) | 2723 (29.9) | |
| Type of surgery, n (%) | < 0.001 | ||
| Ileocecal resection | 91 (0.6) | 57 (0.6) | |
| Right hemicolectomy | 5859 (41.1) | 3370 (37.0) | |
| Transverse colon resection | 167 (1.2) | 117 (1.3) | |
| Left hemicolectomy | 1069 (7.5) | 678 (7.4) | |
| Sigmoid colon resection | 2193 (15.4) | 1312 (14.4) | |
| Total colectomy | 534 (3.7) | 405 (4.4) | |
| Anterior resection | 2157 (15.1) | 1560 (17.1) | |
| Abdomino-perineal excision | 1399 (9.8) | 1088 (11.9) | |
| Hartmann's operation | 777 (5.5) | 518 (5.7) | |
| Neoadjuvant therapy, n (%) | 1005 (7.1) | 938 (10.3) | < 0.001 |
| Missing | 73 (0.5) | 42 (0.5) | |
| Curative treatment, n (%) | 12773 (89.7) | 8175 (89.8) | 0.775 |
| Surgical setting, n (%) | 0.008 | ||
| Elective | 12762 (89.6) | 8057 (88.5) | |
| Acute | 1477 (10.4) | 1046 (11.5) | |
| Missing | 7 (0.0) | 2 (0.0) | |
| Minimally invasive surgery, n (%) | 5867 (41.2) | 4013 (44.1) | < 0.001 |
| Missing | 25 (0.2) | 7 (0.1) | |
| Reoperation, n (%) | 1218 (8.5) | 718 (7.9) | 0.140 |
| Missing | 323 (2.3) | 325 (3.6) | |
| Length of stay, median [IQR] | 7.0 [4.0–10] | 7.0 [4.0–12] | < 0.001 |
| Missing, n (%) | 395 (2.8) | 396 (4.3) | |
| Length of ICU stay, median [IQR] | 3.0 [1.0–6.0] | 2.0 [1.0–5.0] | 0.110 |
| Missing, n (%) | 13533 (95.0) | 8742 (96.0) | |
| 30-day mortality, n (%) | 230 (1.6) | 148 (1.6) | 0.991 |
| Any complication, n (%) | 3527 (24.8) | 2936 (32.2) | < 0.001 |
| Severe complication, n (%) | 1754 (12.3) | 1210 (13.3) | 0.030 |
SD, standard deviation; IQR, interquartile range; BMI, body mass index; ASA, American Society of Anesthesiologists; ICU, intensive care unit