Accurate positioning of the 24-hour pH monitoring catheter: Agreement between manometry and pH step-up method in two patient positions

Figure 1 Bland-Altman scatter graph plotted to assess agreement between measurements obtained manometrically and by the pH step-up method with patients in the upright position. Grey area surrounded by longer dashed line indicates clinically acceptable limits.

Figure 2 Bland-Altman scatter graph plotted to assess agreement between measurements obtained manometrically and by the pH step-up method with patients in the supine position. Grey area surrounded by longer dashed line indicates clinically acceptable limits.