<p>Fisher exact test or chi-square test was used for categorical data. Continuous non-parametric variables were compared by Mann-Whitney u test.</p>†<p>Los Angeles classification grade.</p>‡<p>The values of pH monitor and Impedance findings were expressed as median (25%–75% range).</p><p>Patient profiles and endoscopic findings according to the gastroesophageal flap valve grades.</p
