Figure 1

Prevalent odds ratio of single colorectal adenoma < 5 mm. Adjusted relative prevalence odds ratios derived from spline logistic regression models using restricted cubic splines with knots at the 10th, 50th, and 90th percentiles of the distribution of the insertion time distribution. The reference value (odds ratio = 1) was set at the 5th minute of insertion time. Prevalent odds ratios were adjusted for age, sex, body mass index, waist circumference, family history of colorectal cancer, history of colorectal polyp, diabetes mellitus, hyperlipidemia, aspirin medication, other NSAID medication, calcium supplementation, alcohol use, smoking history, colonoscopist, and bowel preparation (see Table 3 for details).