They used intention to treat in the analysis so it included everyone invited to get a colonoscopy but only 42% got the exam. So 58% did not even get the colono

They used intention to treat in the analysis so it included everyone invited to get a colonoscopy but only 42% got the exam. So 58% did not even get the colonoscopy. It is impossible to say what colonoscopy does or does not prevent when the majority of people in the intervention arm of the study did not get the intervention.