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Demographic variables, patients with adenomas
| Patient Characteristics | Air - with adenomas | Water - with adenomas |
| Number | 183 | 173 |
| Age, mean (SD) | 62.8 (8.2) | 62.5 (7.4) |
| Male | 180 (98%) | 170 (98%) |
| Female | 3 (2%) | 3 (2%) |
| White | 82 (45%) | 97 (56%) |
| Black | 14 (8%) | 14 (8%) |
| Latino | 2 (1%) | 4 (2%) |
| Asian | 2 (1%) | 1 (0.5%) |
| Other | 1 (0.5%) | 1 (0.5%) |
| Unknown | 82 (45%) | 56 (33%) |
| BMI, mean (SD) | 29.6 (4.9) | 29.9 (5.6) |
BMI, body mass index.
