Comparison of baseline characteristics between subjects who underwent follow-up colonoscopy (n=2452) and those who did not (n=1351) in each risk group
| 5-year follow-up | Normal group* | Low-risk group† | High-risk group‡ | ||||||
| Yes | No | p Value | Yes | No | p Value | Yes | No | p Value | |
| Number (%) | 1242 (56.9) | 941 (43.1) | 671 (71.8) | 263 (28.2) | 539 (78.6) | 147 (21.4) | |||
| Age (years), mean±SD | 56.7±8.8 | 54.0±9.8 | <0.001 | 57.8±8.3 | 57.0±9.0 | 0.129 | 59.8±8.4 | 59.8±9.1 | 0.713 |
| Male (%) | 63.4 | 57.8 | <0.001 | 68.3 | 69.7 | 0.601 | 73.3 | 72.3 | 0.533 |
| Family history of CRC (%) | 7.1 | 3.6 | 0.011 | 5.0 | 4.7 | 0.586 | 4.8 | 4.6 | 0.717 |
| BMI (kg/m2), mean±SD | 24.0±2.7 | 23.6±2.9 | 0.180 | 24.2±2.6 | 24.0±2.7 | 0.203 | 24.5±2.7 | 24.4±2.7 | 0.296 |
| WC (cm), mean±SD | 86.9±7.5 | 85.5±8.0 | 0.107 | 87.4±7.3 | 86.7±7.3 | 0.346 | 88.7±7.3 | 87.9±7.5 | 0.121 |
| Current smoking (%) | 18.7 | 16.5 | 0.150 | 22.1 | 21.7 | 0.692 | 25.2 | 26.1 | 0.348 |
| Alcohol consumption (%) | 10.8 | 15.7 | 0.082 | 20.7 | 22.6 | 0.453 | 26.9 | 24.6 | 0.314 |
| Aspirin and/or NSAID use (%) | 15.0 | 14.1 | 0.866 | 16.1 | 17.0 | 0.612 | 19.5 | 18.0 | 0.704 |
| Statin use (%) | 6.4 | 5.9 | 0.486 | 7.6 | 7.3 | 0.517 | 8.5 | 7.8 | 0.270 |
| College graduate (%) | 79.8 | 72.6 | 0.015 | 77.1 | 75.9 | 0.280 | 76.5 | 77.0 | 0.552 |
| High economic status (%)§ | 68.2 | 61.2 | 0.020 | 65.0 | 63.4 | 0.332 | 62.2 | 63.1 | 0.780 |
↵* Subjects with no adenoma at baseline colonoscopy.
↵† Subjects with one or two adenomas <10 mm at baseline colonoscopy.
↵‡ Subjects with an advanced adenoma or ≥3 adenomas at baseline colonoscopy.
↵§ Monthly family income ≥US$5000.
BMI, body mass index; CRC, colorectal cancer; NSAID, non-steroidal anti-inflammatory drug; WC, waist circumference.