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Table 4 24-h pH monitoring at Baseline and 6 months post-operation

From: Non-active implantable device treating acid reflux with a new dynamic treatment approach: 1-year results

% overall time pH < 4 Baseline 6 Months Change Baseline to 6 Months
n 50 45 45
Mean (SD) 16.35% (16.60) 0.80% (1.56) −16.0 (17.46)
Median 10.55% 0.30% −10.05
Min, Max
p-value*
4.3, 94.8 0.0, 8.8 −93.4, 0.3
(p < 0.001)
  1. * Paired t-test of the mean change
  2. Two of the subjects refused the burdensome pH-monitoring test whereof one had a successful GERD-HRQL questionnaire score and one subject had a to too low position of the device already at surgery, prohibiting the function of the device. This later subject refused the pH monitoring test and re-surgery