Table 1.
Characteristics of participants by case/control status and race (North Carolina Colon Cancer Study-Phase II)
| Whites (N=1520) |
African Americans (N=384) |
|||
|---|---|---|---|---|
| Cases (n=720) | Controls (n=800) | Cases (n=225) | Controls (n=159) | |
| Sex (%) | ||||
| Male | 58 | 61 | 52 | 52 |
| Age (years) (%) | ||||
| 40–49 | 19 | 12 | 21 | 18 |
| 50–59 | 28 | 27 | 29 | 23 |
| 60–69 | 32 | 34 | 34 | 42 |
| 70–79 | 22 | 27 | 16 | 18 |
| Mean(SD) | 59.6(10.3) | 61.7(9.8) | 58.0(10.0) | 60.3(9.8) |
| Education (%) | ||||
| <=High School | 50 | 39 | 62 | 59 |
| Some College | 25 | 26 | 22 | 26 |
| College grad/Adv degree | 25 | 35 | 16 | 16 |
| Annual Income (%) | ||||
| <$20,000 | 21 | 18 | 47 | 52 |
| $20,000–$34,999 | 21 | 18 | 19 | 16 |
| $35,000–$49,999 | 15 | 15 | 11 | 8 |
| $50,000–$74,999 | 20 | 23 | 13 | 15 |
| >$75,000 | 24 | 27 | 11 | 10 |
| Body Mass Index (1yr ago) (%) | ||||
| Normal (18.5–24.9 kg/m2) | 23 | 30 | 18 | 18 |
| Overweight (25.0–29.9 kg/m2) | 39 | 41 | 32 | 36 |
| Obese (≥30.0 kg/m2) | 39 | 29 | 51 | 46 |
| Mean(SD) | 29.2(6.3) | 28.0(5.5) | 31.6(7.7) | 29.9(6.5) |
| Smoking Status (%) | ||||
| Current Smoker | 16 | 14 | 23 | 17 |
| Former Smoker | 47 | 49 | 38 | 42 |
| Never Smoker | 37 | 38 | 39 | 41 |
| Mean(SD) years of smoking | 26.9(15.6) | 25.5(16.7) | 24.3(16.3) | 25.2(17.9) |
| Physical activity (MET-min/day*) (%) | ||||
| Quartile 1 | 25.4 | 24.5 | 30.7 | 28.9 |
| Quartile 2 | 24.4 | 23.5 | 25.5 | 28.9 |
| Quartile 3 | 21.1 | 26.5 | 16.0 | 19.5 |
| Quartile 4 | 29.1 | 25.3 | 27.8 | 22.8 |
| Mean(SD) | 2250.0(661.8) | 2152.7(473.4) | 2178.4(545.5) | 2152.8(494.2) |
| NSAID use† (%) | ||||
| Yes | 35 | 46 | 24 | 23 |
| First-degree family history of colorectal cancer (%) | ||||
| Yes | 13 | 11 | 12 | 5 |
*
Metabolic equivalent minutes per day
†
greater than or equal to 15 non-steroidal anti-inflammatory drugs (NSAID) per month in the past 5 years