Table I.
Selected characteristics of colorectal cancer cases and unaffected sibling controls
| Controls | Cases | |||
|---|---|---|---|---|
| (N = 2592) | (N = 1621) | |||
| N | % | N | % | |
| Age | ||||
| Years (mean ± SD) | 53.9±11.7 | 53.6±10.8 | ||
| Sex | ||||
| Male | 1158 | 44.7 | 833 | 51.4 |
| Center | ||||
| Ontario | 499 | 19.3 | 301 | 18.6 |
| Los Angeles | 461 | 17.8 | 335 | 20.7 |
| Australia | 594 | 22.9 | 327 | 20.2 |
| Hawaii | 8 | 0.3 | 7 | 0.4 |
| Mayo | 474 | 18.3 | 251 | 15.5 |
| Seattle | 556 | 21.5 | 400 | 24.7 |
| NSAID use | ||||
| Never/former | 1974 | 76.8 | 1265 | 78.3 |
| Current | 595 | 23.2 | 351 | 21.7 |
| Physical activity | ||||
| Inactive | 598 | 24.5 | 383 | 24.8 |
| Less active | 702 | 28.8 | 433 | 28.0 |
| Active | 582 | 23.9 | 389 | 25.2 |
| Very active | 558 | 22.9 | 340 | 22.0 |
| BMI | ||||
| kg/m2 (mean ± SD) | 26.7±5.2 | 27.2±5.5 | ||
| Cigarette smoking | ||||
| Pack–years (mean ± SD) | 11.7±19.4 | 12.9±19.7 | ||
| Tumor site | ||||
| Colon | ||||
| Right | — | — | 542 | 33.4 |
| Left | — | — | 466 | 28.7 |
| NOS | — | — | 76 | 4.7 |
| Rectal | — | — | 537 | 33.1 |
BMI, body mass index; NOS, not otherwise specified.