Figure 1 .

Median number of reflux episodes per hour, median duration of reflux episodes, and median fractional reflux time during chest physiotherapy in each of four positions carried out using either a standard postural drainage technique (SPT), or a modified regimen without head-down tilt (MPT). Twenty patients were studied twice in each of four positions during both physiotherapy regimens. Error bars show interquartile range. *Wilcoxon signed rank test: p < 0.05.