Table 1.
Baseline characteristics of participants by family history of CRC
| Characteristic | No family history (n = 5818) | Family history (n = 1879) | P value |
|---|---|---|---|
| Age (years, mean + SD) | 62.5 + 9.2 | 60.9 + 9.8 | <0.001 |
| Male (n, %) | 4268 (73.4) | 1198 (63.8) | <0.001 |
| Race (n, %) | |||
| White | 5129 (88.2) | 1734 (92.3) | |
| Black | 340 (5.8) | 72 (3.8) | |
| Other | 349 (6.0) | 73 (3.9) | <0.001 |
| Cigarette smoking status (n, %) | |||
| Never | 1891 (32.5) | 746 (39.7) | |
| Former | 2944 (50.6) | 891 (47.4) | |
| Current | 965 (16.6) | 237 (12.6) | |
| Unknown | 18 (0.30) | 5 (0.30) | <0.001 |
| BMI in kg/m2 (n, %) | |||
| <25 | 1658 (28.5) | 519 (27.6) | |
| 25 to <30 | 2633 (45.3) | 902 (48.0) | |
| >30 | 1516 (26.0) | 455 (24.2) | |
| Missing or unknown | 11 (0.2) | 3 (0.2) | 0.10 |
| Previous polyp (yes, no, %)a | 1398 (24.0) | 498 (26.5) | 0.04 |
a
Self-reported polyp prior to qualifying colonoscopy for entry to study; data missing for 160 participants