Measure Methodology Change: For 2000 and 2005, respondents are asked if they ever had sigmoidoscopy/colonoscopy/proctoscopy as a single question. In 2010, respondents are asked about sigmoidoscopy and colonoscopy as separate questions, as well as additional questions regarding screening.
Inclusion Criteria: NHIS sample adults age 40 and older.
Exclusion Criteria: NHIS sample adults age 18-39. Individuals who were unsure of whether they had received the specified screening.
The colorectal cancer screening questions have been included on the NHIS periodically, with variations in the sets of questions. Not all years included questions on colorectal cancer screening or questions that are directly comparable, which is why only certain years of data appear of this measure. Beginning in 2011, the NHIS will include annually one combined colorectal cancer screening question that asks about three types of testing -- fecal occult blood test, colonoscopy and sigmoidoscopy. However, this question represents a significant change from how the question has been asked in the past and as a result, the 2011 question is likely to result in different estimates of colorectal cancer screening rates, compared with previous estimates. This change in question methodology will be noted when future data are added to this measure.
This measure is calculated by the CDC/National Center for Health Statistics from the National Health Interview Survey.