Characteristics of and risk factors for colorectal neoplasms in young adults in a screening population

Figure 1 Study population. In total, 4668 subjects who underwent screening colonoscopy were reviewed during study period. 1849 subjects were excluded for the reasons stated in the Methods section. The remaining 2819 subjects were enrolled and divided to 4 groups according to age (< 40 years, 40-44 years, 45-49 years, and ≥ 50 years).

Figure 2 Hierachial cluster analysis. Scatter plot shows relationships among the age and incidence of adenoma. A and B indicates the age and incidence of colorectal adenoma and advanced adenoma, respectively. Red broken lines indicate demarcations from cluster analysis.