Table 1: Sensitivity of the parameters.

VariablesSensitivity (%)

Total percentage of monitoring time with pH below 4 (%)83.6
The percentage of time with pH below 4 in an upright position (%)72.7
The percentage of time with pH below 4 in a supine position65.5
Number of reflux episodes (times)81.9
Number of episodes longer than 5 minutes (times)74.5
Longest reflux duration (minutes)69.1
DeMeester scores85.5