Fig. 2

Gastric pH of 376 patients tested under standard strips (x-axis) and novel ester-impregnated strips (y-axis). Each dot corresponds to one data point. Horizontal and vertical lines indicate the recommended pH cut-offs of 5.5. The diagonal line indicated where the pH readings were identical under the novel and standard strips. All the dots beneath (above) the diagonal lines indicated those pH readings that were higher (lower) under the standard strips than under the novel strips