Table 3

Characteristics of polyps (mean sizes, counts) found at first and second colonoscopy by randomization arm

First colonoscopy mean polyp size ± SD in mm (counts)Second colonoscopy mean polyp size ± SD in mm (counts)
Intensive inspection arm subjects (n = 23)Chromoendoscopy arm subjects (n = 27)Intensive inspection arm subjects (n = 23)Chromoendoscopy arm subjects (n = 27)
All polyps3.09 ± 2.74 (33)4.50 ± 3.23 (28)2.80 ± 1.03 (10)2.27 ± 1.18 (35)
Adenomatous polyps3.57 ± 3.25 (21)4.68 ± 3.59 (19)3.20 ± 0.84 (5)2.66 ± 0.97 (19)
 Morphology
  Flat3.42 ± 2.02 (12)1.00 ± 0.00 (2)3.00 ± 1.00 (3)2.36 ± 1.18 (7)
  Polypoid3.78 ± 4.55 (9)5.12 ± 3.55 (17)3.50 ± 0.71 (2)2.83 ± 0.83 (12)
 Location
  Right-sided3.72 ± 3.65 (14)4.36 ± 2.95 (14)3.00 ± 0.00 (2)2.72 ± 1.03 (16)
  Left-sided5.00 ± NC (1)3.50 ± 0.71 (2)2.00 ± NC (1)3.00 ± NC (1)
  Rectal3.00 ± 2.61 (6)7.00 ± 7.00 (3)4.00 ± 0.00 (2)2.00 ± 0.00 (2)
Hyperplastic polyps2.25 ± 1.22 (12)4.11 ± 2.42 (9)2.40 ± 1.14 (5)1.81 ± 1.28 (16)
 Morphology
  Flat2.33 ± 1.03 (6)3.50 ± 0.71 (2)4.00 ± NC (1)1.67 ± 0.52 (6)
  Polypoid2.17 ± 1.47 (6)4.29 ± 2.75 (7)2.00 ± 0.82 (4)1.90 ± 1.60 (10)
 Location
  Right-sided3.20 ± 1.31 (5)5.25 ± 3.30 (4)2.00 ± NC (1)3.00 ± 1.73 (3)
  Left-sided1.00 ± NC (1)4.00 ± NC (1)(0)(0)
  Rectal1.67 ± 0.52 (6)3.00 ± 1.15 (4)2.50 ± 1.29 (4)1.54 ± 1.05 (13)
Normal samples1.5 ± 1.31 (8)3.57 ± 2.07 (7)2.00 ± 0.00 (2)2.50 ± 3.04 (22)
 Location
  Right-sided1.67 ± 2.08 (3)3.40 ± 2.07 (5)(0)2.91 ± 4.13 (11)
  Left-sided(0)(0)(0)3.33 ± 1.53 (3)
  Rectal1.40 ± 0.89 (5)4.00 ± 3.83 (2)2.00 ± 0.00 (2)1.63 ± 1.06 (8)

NOTE: Data are mean ± SD (number of specimens).

Abbreviation: NC, not calculable.