Table 1.
Characteristics of the Kentucky Colon Cancer Case-Control Study population
| Characteristic | Cases (N = 438) | Controls (N = 491) | P valuea |
|---|---|---|---|
| Age (years) | 62.8 (10.6)b | 58.3 (11.1)b | <0.001 |
| Gender | |||
| Male | 216 (49.5%) | 185 (37.9%) | <0.001 |
| Female | 220 (50.5%) | 305 (62.1%) | – |
| Race | |||
| White | 413 (94.7%) | 458 (93.3%) | 0.48 |
| African American | 17 (3.9%) | 21 (4.3%) | – |
| Other | 6 (1.4%) | 12 (2.4%) | – |
| Education | |||
| <8 Years | 28 (6.4%) | 8 (1.6%) | <0.001 |
| 8–11 Years | 42 (9.7%) | 46 (9.4%) | – |
| High school (HS) diploma | 135 (31.0%) | 131 (26.8%) | – |
| Some post-HS training | 134 (30.9%) | 158 (32.3%) | – |
| Bachelor's degree | 38 (8.7%) | 63 (12.9%) | – |
| Graduate degree | 58 (13.3%) | 83 (17.0%) | – |
| Income | |||
| <$15,000 | 56 (13.0%) | 58 (12.0%) | 0.02 |
| $15,000–$29,000 | 110 (25.6%) | 119 (24.6%) | – |
| $30,000–$44,000 | 92 (21.4%) | 79 (16.4%) | – |
| $45,000–$69,000 | 90 (20.9%) | 93 (19.3%) | – |
| ≥$70,000 | 67 (15.6%) | 115 (23.8%) | – |
| Refused | 15 (3.5%) | 19 (3.9%) | – |
| Smoker (ever vs. never) | 236 (54.4%) | 267 (54.8%) | 0.32 |
| Drank alcohol (yes vs. no) | 95 (25.3%) | 92 (25.3%) | 0.17 |
| Family history of colorectal cancer | 114 (26.2%) | 77 (15.7%) | <0.001 |
| Physical activity | |||
| Light intensityc | 167 (38.4%) | 209 (42.6%) | 0.34 |
| Moderate intensityc | 153 (35.2%) | 153 (31.1%) | – |
| Vigorous intensityc | 115 (26.4%) | 129 (26.3%) | – |
| NSAIDs use (yes vs. no) | 266 (62.4%) | 328 (68.5%) | 0.06 |
NSAID, Nonsteroidal anti-inflammatory drug.
a
P value for t-test or χ2-test with k (number of groups)-1 degrees of freedom.
b
Mean and s.d. of the mean in parentheses.
c
Light intensity: 1 to <3.0 metabolic equivalents (METs); moderate intensity: ≥3.0 to ≤6.0 METs; vigorous intensity: >6.0 METs.