Table 2

Twenty four hour pH studies

GroupsCompleted studiesMedian reflux index (%)Reflux index rangeAbnormal studies (%)Pattern of pH tracing
3 pH study data unavailable.
CMSE915.37.6–2689Non-phasic
Control76.30–19.843Non-phasic
PRO613.53.2–8767Non-phasic
DC4*8.50.7–55.450Non-phasic