Fig. 4From: Respiratory symptoms, sleep-disordered breathing and biomarkers in nocturnal gastroesophageal reflux a Interleukin 8 levels in plasma among nGER subjects with or without exacerbations of respiratory symptoms. The transverse line represents median value. b Substance P levels in exhaled breath condensate among subjects with nGER with or without nocturnal cough. The transverse line represents median value. P-values calculated with Wilcoxon rank-sum testBack to article page