Table 1. Baseline characteristics of the patients (N = 18,816).
| Factors | N = 18,816 |
|---|---|
| Age category (years) | |
| < 50 | 3,499 (18.60) |
| 50–59 | 4,459 (23.70) |
| 60–69 | 5,382 (28.60) |
| 70–79 | 4,276 (22.73) |
| ≥ 80 | 1,200 (6.38) |
| Sex, male | 12,890 (68.51) |
| Current smoker* | 2344 (25.48) |
| Family history of colorectal cancer* | 105 (2.95) |
| Comorbidities | |
| Ischemic heart diseases | 2579 (13.71) |
| Chronic heart failure | 1634 (8.68) |
| Peripheral vascular diseases | 1074 (5.71) |
| Cerebral vascular diseases | 1240 (6.59) |
| Dementia | 189 (1.00) |
| COPD | 354 (1.88) |
| Collagen diseases | 567 (3.01) |
| Peptic ulcer diseases | 5998 (31.88) |
| Diabetes mellitus | 4692 (24.94) |
| Chronic kidney disease | 304 (1.62) |
| Paresthesia | 399 (2.12) |
| Leukemia | 33 (0.18) |
| Malignant lymphoma | 135 (0.72) |
| Liver cirrhosis | 285 (1.51) |
| AIDS | 46 (0.24) |
| Indications for colonoscopy | |
| Positive FIT | 2995 (15.92) |
| Initial colonoscopy findings | |
| Polyp detection | 8017 (42.61) |
| 10-mm adenoma detection* | 379 (2.80) |
| 20-mm adenoma detection* | 98 (0.73) |
| Therapeutic colonoscopy | 3277 (17.42) |
| Number of repeat colonoscopies | |
| 1 | 10705 (56.89) |
| 2 | 4657 (24.75) |
| 3 | 1775 (9.43) |
| 4 | 721 (3.83) |
| 5 | 421 (2.24) |
| 6 | 279 (1.48) |
| 7 | 165 (0.88) |
COPD, chronic pulmonary disease; AIDS, acquired immune deficiency syndrome; FIT, fecal immunochemical test. Parentheses are percentages.
*Missing data are included.