Table 1. Characteristics of study population.
|
Variable
|
Cases | Controls | |
|---|---|---|---|
| Number | 320 (35%) | 594 (65%) | |
| Sex | |||
| Male | 192 (60%) | 324 (55%) | |
| Female | 128 (40%) | 270 (45%) | |
| Age (years) | 68.91 ± 10.08 | 66.12 ± 10.23 | |
| AJCC stage | |||
| I | 56 (18%) | ||
| II | 107 (33%) | ||
| III | 134 (42%) | ||
| IV | 21 (7%) | ||
| Unknown | 2 (1%) | ||
| Total | 320 (100%) | ||
| Site | |||
| Colon | 128 (40%) | ||
| rectosigmoid | 7 (2%) | ||
| Rectum | 94 (29%) | ||
| Unknown | 91 (28%) | ||
| Total | 320 (100%) | ||
| Tumour size (cm) | 5.0 ± 2.1 | ||
| range (cm) | 1-13 | ||
| Lymph nodes a | |||
| Sampled | 15 (IQR: 14-19) | ||
| positive (%) | 5 (IQR: 0-27) | ||
| positive (%, if 0 positive) | 27 (IQR: 12-49) | ||
a
only cases with 12 or more lymph nodes sampled are included (N=156)