Figure 1. Cumulative prevalence of intestinal metaplasia during endoscopic surveillance (endoscopies one through six) in patients with varying lengths of esophageal columnar lining. The lengths of columnar lining were 1 to 2 cm (A), 3 to 4 cm (B), 5 to 6 cm (C), and longer than 6 cm (D). The number of patients at each endoscopy is denoted within the bars.