Comparison of results from the previous study by Porter and colleagues with those of the present study
| Factor | Porter et al. (2) | Present study |
|---|---|---|
| Study period | 1983–1990 | 1998–2004 |
| No. cases | 683 | 433 |
| Age, mean, yr | 65 | 65 |
| Total surgeons, no. | 52 | 42 |
| Colorectal surgeons, no. | 5 | 5 |
| Cases by colorectal surgeons, no. (%) | 109 (16) | 150 (35) |
| High-volume surgeons, no. | NA | 9 |
| Cases by high-volume surgeons, no. (%) | 360 (53) | 278 (64) |
| Chemotherapy/radiation therapy, no. (%) | 432 (64) | 171 (39) |
| Neoadjuvant therapy, no. (%) | 68 (11) | 175 (40) |
| Adjuvant therapy, no. (%) | 169 (25) | 87 (20) |
| Overall 5-year DSS, % | 59 | 81 |
| Overall 5-year LR, % | 33 | 7 |
| Colorectal trained surgeons LR, % | 13.4* | 8.7 |
| Non-colorectal trained surgeons LR, % | 37.4* | 6.7 |
| Effect of training on 5-year LR, HR† | 2.49* | 1.03 |
| Colorectal trained surgeons DSS, % | 61* | 86 |
| Non-colorectal trained surgeons DSS, % | 44* | 79 |
| Effect of training on 5-year DSS, HR† | 1.52* | 1.85* |
| High volume surgeons LR, % | 26.0* | 8.3 |
| Low volume surgeons LR, % | 42.2* | 5.8 |
| Effect of volume on 5-year LR, HR† | 1.80* | 0.70 |
| High volume surgeons DSS, % | 54* | 80 |
| Low volume surgeons DSS, % | 39* | 84 |
| Effect of volume on 5-year DSS, HR† | 1.40* | 0.62 |