Characteristics of the study participants; the Tennessee Colorectal Polyp Study
| No-polyp controls | Hyperplastic polyps | Conventional adenomas | Sessile serrated polyps | ||
|---|---|---|---|---|---|
| Characteristic | n=3851 | n=560 | n=1779 | n=214 | pheterogeneity |
| Study site of procedure* | |||||
| VUMC | 74.8 | 70 | 74.5 | 74.6 | 0.07 |
| VA-Nashville Campus | 25.2 | 30 | 25.6 | 25.4 | |
| Age (years) | 57.2±7.7 | 56.8±7.1 | 59.0±7.4 | 57.8±7.7 | <0.001 |
| Sex (% female) | 44.8 | 36.4 | 27.5 | 36 | <0.001 |
| Race (% Caucasian) | 87 | 89.3 | 87 | 89.7 | 0.34 |
| Family history of colorectal cancer (CRC) (%)* | 9 | 8.6 | 9.4 | 11.9 | 0.44 |
| Indication for colonoscopy (%)* | |||||
| Average risk screening | 56.9 | 54.3 | 55.7 | 57.9 | 0.2 |
| Family history of CRC | 12.6 | 13.7 | 12.5 | 16.2 | |
| Diagnostic/follow-up | 22.8 | 21.6 | 23.6 | 15.4 | |
| Other | 7.8 | 10.4 | 8.2 | 10.5 | |
| Educational attainment (%)* | |||||
| High school or less | 23.4 | 29.5 | 28.3 | 25 | <0.001 |
| Some college | 28.4 | 28.3 | 28.5 | 27.4 | |
| College graduate | 21.4 | 21.9 | 22.1 | 27.1 | |
| Graduate/professional school | 26.8 | 20.3 | 21.1 | 20.5 | |
| Household income (%)* | |||||
| Under $15 000 | 7.8 | 9.6 | 10.6 | 6.7 | 0.002 |
| $15 001–$30 000 | 14.1 | 17.9 | 16.2 | 15.6 | |
| $30 001–$50 000 | 20.4 | 17.2 | 19.8 | 23.3 | |
| Over $50 000 | 57.7 | 55.3 | 53.5 | 54.4 | |
| Daily energy intake (kcal)* | 1845 | 1938 | 1912 | 1820 | 0.009 |
*Standardised by age (using ages grouped into 5-year categories starting at age 40) and sex.
VA, Veterans Affairs; VUMC, Vanderbilt University Medical Center.