Tolerability of magnifying narrow band imaging endoscopy for esophageal cancer screening

Figure 2 Mean visual analogue scale scores for retrosternal pain. Visual analogue scale (VAS) scores in the NBI group were significantly better than those in the Lugol group (P = 0.024, Lugol group vs NBI group, ANOVA for repeated measures). VAS scores for heartburn at 1 h after the examinations were better in the NBI group than those in the Lugol group (^bP < 0.01, Lugol group vs NBI group, Wilcoxon’s rank sum test).