Slide 4. Colonoscopy frequency following a Polypectomy: Methodology.

Slide 4Colonoscopy frequency following a Polypectomy: Methodology

SLIDE NOTES 4: To address the first question: What happens to patients in the years following a polypectomy with respect to receipt of a colonoscopy? The sample consisted of individuals present in 1994 and later years. Each individual was followed until death, disenrollment from fee-for-service Medicare; or the end of the study period (1999).

Of that group, any individual who had undergone a polypectomy, either by sigmoidoscopy or full colonoscopy was identified.

I then identified the month of the first colonoscopy that occurred at least 6 months following the polypectomy. Colonoscopies performed within 6 months of the index polypectomy could have been follow-up procedures related to the polypectomy. We were interested in long-term surveillance procedures.

Finally, we tested the effect on the analysis of eliminating any individual with any kind of cancer diagnosis. Because we were dealing with claims data, we had to rely on a record of an ICD-9 cancer diagnosis in any claim over the beneficiary's claim history. We defined as “potential cancer beneficiaries” any individuals who had a cancer diagnosis in at least two different months in the period.

From: Appendix M, Recent Trends in Follow-up Surveillance in Medicare Beneficiaries

Cover of Economic Models of Colorectal Cancer Screening in Average-Risk Adults
Economic Models of Colorectal Cancer Screening in Average-Risk Adults: Workshop Summary.
Institute of Medicine (US); National Research Council (US); Pignone M, Russell L, Wagner J, editors.
Washington (DC): National Academies Press (US); 2005.
Copyright © 2005, National Academy of Sciences.

NCBI Bookshelf. A service of the National Library of Medicine, National Institutes of Health.