percentage of time with esophageal ph below 4 was 33.2 % in patients with barrett 's esophagus , 14 % in patients with slight-to-moderate esophagitis ( p less than 0.001 ) , and 3.4 % in controls ( p less than 0.001 ) .
C0004763
barrett 's esophagus
C0014868
esophagitis