Table 1.
Prevalence of colorectal adenoma by demographic characteristic and risk factors among a nested case-control of IRAS Colon study participants
| Characteristic | No Adenoma N = 97 | Any Adenoma N = 97 | p-value |
|---|---|---|---|
| Center | |||
| San Antonio, TX | 26 (50.0) | 26 (50.0) | 1.00 |
| San Luis Valley, CO | 20 (50.0) | 20 (50.0) | |
| Oakland, CA | 34 (50.0) | 34 (50.0) | |
| Los Angeles, CA | 17 (50.0) | 17 (50.0) | |
| Sex | |||
| Male | 33 (39.8) | 50 (60.2) | 0.01 |
| Female | 64 (57.7) | 47 (42.3) | |
| Age | |||
| <60 | 36 (62.1) | 22 (37.9) | <0.01 |
| 60-69 | 42 (53.9) | 36 (46.2) | |
| 70+ | 19 (32.8) | 39 (67.2) | |
| Race/Ethnicity | |||
| Non-Hispanic White | 32 (43.2) | 42 (56.8) | 0.14 |
| Black | 35 (60.3) | 23 (39.7) | |
| Hispanic | 30 (48.4) | 32 (51.6) | |
| Glucose tolerance at 1992-94 | |||
| Normoglucose | 54 (49.5) | 55 (50.5) | 0.68 |
| Impaired glucose tolerance | 20 (57.1) | 15 (42.9) | |
| Type II diabetes mellitus | 23 (47.9) | 25 (52.1) | |
| BMI (kg/m2) at 2002-2004 | |||
| Normal (<25kg/m2) | 54 (50.0) | 54 (50.0) | 1.00 |
| Overweight (25-29.9 kg/m2) | 19 (50.0) | 19 (50.0) | |
| Obese (30 + kg/m2) | 24 (50.0) | 24 (50.0) | |
| Smoking at 2002-2004 | |||
| Never | 51 (53.7) | 44 (46.3) | 0.32 |
| Ever | 46 (46.7) | 53 (53.5) | |
| Self reported previous screening | |||
| None | 34 (54.8) | 28 (45.2) | <0.01 |
| Yes, without polyp | 56 (54.9) | 46 (45.1) | |
| Yes, with polyp | 7 (23.3) | 23 (76.7) | |
| NSAID use | |||
| None or Don’t Know | 33 (45.2) | 40 (54.8) | 0.30 |
| Yes | 64 (52.9) | 57 (47.1) |
Population data for participants included in the Insulin Resistance Atherosclerosis Study (IRAS). Details of the design and recruitment have been published previously [29]. Numbers in the parentheses represent the percentage of the total individuals included in each category. Statistical significance was determined used Chi-squared test.