Table 4

Size of a patient's largest adenoma in intervention and control arms

Intervention armControl arm
AdenomasFirst screenRe-screenAll screen detectedNon-responder*Interval adenomasAdenoma follow-upTotal (128 6526 person-years)Subjects with an adenoma per 1000 person-yearsControls (128 6877 person-years)Subjects with an adenoma per 1000 person-years
First invitationLater invitationWithin 2 yearsAfter 2 years
<10 mm49 (14%)10 (20%)100 (26%)159 (21%)186 (29%)68 (45%)375 (50%)808680.686010.47
10–19 mm174 (52%)25 (49%)197 (51%)396 (51%)182 (28%)55 (36%)272 (36%)579620.755800.45
≥20 mm115 (34%)16 (31%)88 (23%)219 (28%)89 (14%)28 (19%)110 (15%)154610.363030.24
Total3385138577445715175715222911.7814841.15
  • Person-years figures used in this table are based on cancer incidence without taking into account adenoma incidence. This table refers to a patient's largest adenoma at an investigation.

  • * Did not respond to any screening round.

  • Had negative faecal occult blood test at the screening before diagnosis of adenoma was made or it was not detected by investigation after a positive test.