Table 1

Data on 100 patients from the study of Small and colleagues.22 Those with abnormal acid exposure were classified as having reflux disease, regardless of their symptom pattern

Normal acid exposure
Abnormal acid exposure: Reflux diseaseModerate or severe heartburnMild or no heartburn
Number and mean oesophageal acid exposure values for patients with acid exposure within the normal range are given, according to reflux symptoms.
Percentage of 24 hours that pH <410.8 (1.5) 1.4 (0.2) 0.8 (0.2)
No of patients204436