Table 1.

Patient characteristics

Baseline measures (range of values)NInterventiona (n)P
RSP/AP (41)RS/AP (30)A/RSP (31)A/RS (31)
Age
 Mean (SD)18.2 (7.8)17.9 (10.8)17.2 (6.9)18.8 (7.9)0.90
n13341303131
Sex, n (%)
 Female6619 (46.3)21 (70.0)12 (41.4)14 (45.2)χ2(3) = 6.2, P = 0.10
 Male6522 (53.7)9 (30.0)17 (58.6)17 (54.8)
 Total13141 (100)30 (100)29 (100)31 (100)
Number of endoscopies, n
 27620192116
 330123312
 4154542
 58431
 611
 722
 811
 Total13341303131
Polyp data
 At least 1 polyp found, n (%)
  No131 (2.4)5 (17.9)3 (10.0)4 (13.3)χ2(3) = 4.8, P = 0.18
  Yes11640 (97.6)23 (82.1)27 (90.0)26 (86.7)
  Total12941 (100)28 (100)30 (100)30 (100)
 Number of polyps in the rectum and sigmoid colon (0, 200)
  Mean (SD)29.8 (43.0)29.7 (52.5)22.7 (32.3)25.6 (44.4)0.53b
  n12941283030
 Total number of polyps (0, 425)
  Mean (SD)56.7 (86.4)63.8 (115.6)44.5 (90.5)43.1 (76.2)0.60b
  n12941283030
 Size of largest polyp (0.5, 50), mm
  Mean (SD)6.1 (8.2)4.2 (2.7)4.0 (2.5)4.3 (2.4)0.63b
  n11038212724
Crypts
 Crypt width (74.2, 199.7)
  Mean (SD)121.5 (21.6)110.7 (20.3)116.8 (24.1)111.5 (17.3)0.16b
  n11335242529
 Crypt length (290.4, 765.1)
  Mean (SD)499.4 (84.4)467.3 (92.9)494.8 (75.6)498.6 (69.1)0.27b
  n11235242528
 Mean total CCP (0.2, 37.9)
  Mean (SD)5.3 (4.9)6.1 (7.8)7.5 (6.1)6.1 (4.2)0.27b
  n11335242529
  • aRaw means presented.

  • bLog-transformed measures used in the tests.