Table 1

Characteristics of patients and their adenomas upon initial examination

n (%)
Gender
 Men3373 (58.4)
 Women2406 (41.6)
Age (years)
 <602372 (41.0)
 60–792933 (50.8)
 ≥80474 (8.2)
Known family history of colorectal cancer
 Yes567 (9.8)
 No5212 (90.2)
Reasons for initial colonoscopy
 Symptoms3364 (58.2)
 Without symptoms478 (8.3)
  Faecal occult blood test155 (2.7)
  Family history263 (4.6)
  Other60 (1.0)
 Unknown1937 (33.5)
Number of adenomas
 14281 (74.1)
 ≥21498 (25.9)
Adenoma location
 Proximal only900 (15.6)
 Distal only2603 (45.0)
 Rectum only1520 (26.3)
 Multiple locations638 (11.0)
 Unknown118 (2.0)
Maximal adenoma size*
 <10 mm3418 (59.1)
 ≥10 mm1578 (27.3)
 Unknown783 (13.6)
Histology*
 Villous component930 (16.1)
 Tubulous only4820 (83.4)
 Unknown29 (0.5)
Dysplasia*
 High-grade280 (4.9)
 Low-grade5486 (94.9)
 Unknown13 (0.2)
Advanced adenomas*
 Yes1899 (32.9)
 No3236 (56.0)
 Unknown644 (11.1)
  • * Characteristics of the most affected adenoma.