Figure 1.

Data selection flow-chart. "Duplicates" are old versions of updated data sets. In cases where multiple examinations were performed in 2006 ("multiple entries"), only the first examination (index colonoscopy) was considered. Data from pediatric patients were excluded. The remaining data sets were used to analyze acute complications and process quality ("data sets process quality, complications"). To analyze adenoma and carcinoma epidemiology, the data were restricted further to include only patients whose place of residence was in Bavaria ("data sets epidemiology").