For a SIGMOIDOSCOPY, a flexible tube is inserted into the rectum to look for problems.
A COLONOSCOPY is similar, but uses a longer tube, and you are usually
given medication through a needle in your arm to make you sleepy and
told to have someone else drive you home after the test.
Was your MOST RECENT exam a sigmoidoscopy or a colonoscopy?

Response Unweighted Frequency Weighted Percentage Standard Error 95% Confidence Limit
Lower Upper
Colonoscopy 5143 96.2 0.3 95.5 96.8
Sigmoidoscopy 205 3.8 0.3 3.2 4.5

Among respondents ages 50 years and older who reported ever having a
sigmoidoscopy or colonoscopy, excluding unknowns and refusals.