Table 1.
Descriptive characteristics of study participants
| Whites | African Americans | |||||
|---|---|---|---|---|---|---|
|
| ||||||
| Characteristic1 | Cases (n=312) | Controls (n=545) | p-value | Cases (n=240) | Controls (n=328) | p-value |
| Age | ||||||
| < 65 | 133 (43) | 198 (36) | 0.0001 | 131 (55) | 134 (41) | 0.0001 |
| >= 65 | 179 (57) | 347 (64) | 109 (45) | 194 (59) | ||
| Race | ||||||
| Caucasian | 313 (57) | 546 (62) | 0.001 | 313 (57) | 546 (62) | 0.001 |
| African American | 240 (43) | 329 (38) | 240 (43) | 329 (38) | ||
| Gender | ||||||
| Female | 140 (45) | 241 (44) | 0.25 | 123 (51) | 176 (54) | 0.06 |
| Male | 172 (55) | 304 (56) | 117 (49) | 152 (46) | ||
| Family History of colon cancer | ||||||
| No | 242 (78) | 487 (90) | 0.0001 | 195 (81) | 300 (92) | 0.0001 |
| Yes | 68 (22) | 52 (10) | 45 (19) | 27 (8) | ||
| Diabetes | ||||||
| No | 256 (82) | 475 (87) | 0.03 | 175 (73) | 239 (73) | 0.70 |
| Yes | 55 (18) | 69 (13) | 64 (27) | 89 (27) | ||
| BMI 1 year ago (categorical) | ||||||
| Normal (18–24.9) | 84 (28) | 161 (30) | 0.56 | 34 (15) | 62 (20) | 0.13 |
| Overweight (25–29.9) | 127 (42) | 227 (43) | 97 (42) | 114 (37) | ||
| Obese (>=30) | 92 (30) | 140 (27) | 98 (43) | 130 (43) | ||
| Physical Activity (MET-minutes per day) (mean (SD)) | 2,240 (534) | 2,207 (509) | 0.55 | 2,259 (611) | 2,142 (522) | 0.22 |
| Calories (kcal per day) (mean (SD)) | 1,987 (721) | 1,804 (602) | 0.43 | 1,973 (857) | 1,733 (689) | 0.002 |
| Smoking | ||||||
| Never | 103 (33) | 217 (40) | 0.01 | 106 (45) | 143 (44) | 0.57 |
| Former | 266 (54) | 244 (45) | 81 (34) | 110 (44) | ||
| Current | 41 (13) | 83 (15) | 50 (21) | 75 (23) | ||
| Used >= 15 NSAIDs per month in past 5 years | ||||||
| Yes | 97 (31) | 194 (36) | 0.32 | 48 (20) | 96 (29) | 0.06 |
| No | 215 (69) | 351 (64) | 191 (80) | 232 (71) | ||
1
Categorical variables are given as n (%). Continuous variables are given as mean and standard deviation (se).