Table 1. Demographic characteristics of bariatric surgery cohort.
| Cohort (n=328) | Bariatric surgery before colonoscopy—125 (38.1%) | Bariatric surgery after colonoscopy—203 (61.9%) | P value |
|---|---|---|---|
| Age at surgery | 47.3±0.3 | 56.5±0.3 | <0.0001 |
| Age at colonoscopy | 52.4±0.2 | 53.7±0.20 | <0.0001 |
| Female sex—no. (%) | 92 (73.60%) | 45 (56.25%) | 0.0963 |
| BMI before surgery (kg/m2) | 48.6±0.7 | 44.5±0.5 | <0.0001 |
| BMI 1 year after surgery (kg/m2) | 30.9±1.0 | 33.1±0.6 | 0.0904 |
| Time from surgery to colonoscopy (years) | 5.0± 3.1 | N/A | |
| Type of surgery | 0.9999 | ||
| Lap Roux-en-Y | 79 (63.20%) | 143 (70.40%) | |
| Lap sleeve | 6 (4.80%) | 43 (21.20%) | |
| Lap gastric banding | 5 (4.00%) | 4 (2.00%) | |
| Open Roux-en-Y | 35 (28.00%) | 13 (6.40%) | |
| BMI at Colo (kg/m2) | 31.55±1.24 | 42.74±0.89 | <0.0001 |
| Race—no. (%) | 0.5348 | ||
| White | 102 (81.60%) | 171(84.24%) | |
| Black | 9 (7.20%) | 18(14.40%) | |
| Hispanic | 12 (9.60%) | 13(10.40%) | |
| Native American | 1 (0.80%) | 1(0.08%) | |
| Asian | 1 (0.80%) | 0(0%) | |
| Smokers—no. (%) | 23 (18.40%) | 34(16.75%) | 0.7015 |
| Metformin use—no.(%) | 40 (32.00%) | 50(24.63%) | 0.1463 |
| Aspirin use—no.(%) | 40 (32.00%) | 83(40.89%) | 0.1064 |
| Adenoma—no.(%) | 21 (16.80%) | 72(35.47%) | 0.0003 |
BMI, body mass index; NA, not available.
Data are presented as the mean plus/minus s.e. or number. P values were calculated by Student's t-test, two-tailed Fisher's exact test, or χ2 test. P values less than 0.05 are in bold.