Table 1.
Comparison of Baseline Characteristics among Subjects Who Underwent a Follow-up Colonoscopy
| Characteristic | Overall (n=1,974) | Normal group (n=574) | Low-risk group (n=1,050) | High-risk group (n=350) | p-value |
|---|---|---|---|---|---|
| Age, yr | 55.7±7.1 | 53.3±6.4 | 56.1±6.8 | 58.3±7.6 | <0.0001 |
| Male sex | 1,423 (72.1) | 379 (66.0) | 768 (73.1) | 276 (78.9) | <0.0001 |
| Follow-up duration, mo | 41.8±21.7 | 49.5±23.7 | 38.9±20.1 | 37.7±19.6 | <0.0001 |
| 2 Or more adenomas | 572 (29.0) | - | 279 (26.6) | 293 (83.7) | <0.0001 |
| Advanced adenoma | 201 (10.2) | - | - | 201 (57.4) | |
| Age group, yr | <0.0001 | ||||
| 40–59 | 1,438 (72.9) | 475 (82.8) | 753 (71.7) | 210 (60.0) | |
| 60–69 | 439 (22.2) | 86 (15.0) | 241 (23.0) | 112 (32.0) | |
| ≥70 | 97 (4.9) | 13 (2.2) | 56 (5.3) | 28 (8.0) | |
| Adenoma location | <0.0001 | ||||
| Right-sided only | 542 (27.5) | - | 475 (45.2) | 67 (19.1) | |
| Left-sided only | 549 (27.8) | - | 466 (44.4) | 83 (23.7) | |
| Both RT and LT | 309 (15.7) | - | 109 (10.4) | 200 (57.2) | |
| Villous component | 69 (3.5) | - | - | 69 (19.7) | |
| Adenoma ≥1 cm | 182 (9.2) | - | - | 182 (52.0) | |
| ≥3 Adenomas | 239 (12.1) | - | - | 239 (68.3) | |
| Current smoking | 320 (16.2) | 71 (12.4) | 175 (16.7) | 74 (21.1) | 0.002 |
| Family history of colorectal cancer | 79 (4.0) | 20 (3.5) | 46 (4.4) | 13 (3.7) | 0.648 |
| Withdrawal time, min | 7.9±5.0 | 4.6±2.4 | 8.3±3.6 | 12.2±5.8 | <0.001 |
Data are presented as mean±SD or number (%).
RT, right side of the colon; LT, left side of the colon.