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Staging information for colorectal cancers for the study groups
| Stage | Colorectal group number (%) | General surgical group number (%) | Historical group number (%) |
| Stage I | 81 (22%)a | 9 (7%) | 57 (12%) |
| Stage II | 95 (26%)b | 53 (39%) | 159 (33%) |
| Stage III | 91 (25%) | 41 (30%) | 146 (31%) |
| Stage IV | 91 (25%) | 29 (21%) | 106 (22%) |
| Stage unknown | 4 (1%) | 4 (3%) | 7 (2%) |
P < 0.05,
P < 0.05 vs the other two group with the Chi-square test.
