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Table 1 Acid exposure in the esophagus in healthy volunteers

From: Response of the airways and autonomic nervous system to acid perfusion of the esophagus in patients with asthma: a laboratory study

  Proximal sensor ( n= 16) Distal sensor ( n= 26)
Parameter Median (range) 95th percentile Median (range) 95th percentile
Total % time pH<4 0.07 (0-0.4) 0.4 0.4 (0.08-1.5) 1.5
% time pH<4 in upright position 0.02 (0-0.4) 0.4 0.2 (0-3.0) 3.0
% time pH<4 in supine position 0.12 (0-0.5) 0.5 0.4 (0.07-2.8) 2.8
Total no. of reflux episodes 6.0 (0-25.0) 25.0 18.0 (2.7-94.2) 94.2
No. of episodes ≥ 5 min 0 (0-1) 1.0 0 (0-2) 2.0
Duration of longest reflux, min 0.9 (0-7.8) 7.8 1.9 (0.5-20.6) 20.6
DeMeester score 0.95 (0.2-4.8) 4.8 3.35 (0.7-11.5) 11.5