Fig. 3.

Change (mean 95 % confidence interval, n = 20) in a prostaglandin E2, b thromboxane B2, c substance P in pharyngeal lavage fluid of healthy volunteers after tonic pharyngeal stimulation (the grey shaded area) with cold dry air (12 °C, 20 % humidity at 12 L/min for 15 min). Results are the means of two tests. Student’s t test was used with Bonferroni-adjusted P values shown