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Table 1 IOS indices Pre and Post Citric acid Cough challenge (n = 39).

From: Validation of the ERS standard citric acid cough challenge in healthy adult volunteers

IOS Variable CA cough challenge with KoKo DigiDoser CA Challenge with Mefar dosimeter P value
Baseline
R5 (kPa/L/sec) 0.331 (0.30,0.36) 0.334(0.30,0.37) 0.95
R20 (kPa/L/sec) 0.281(0.26,0.31) 0.282 (0.25,0.31) 0.99
R5-R20 (kPa/L/sec) 0.050 (0.04,0.60) 0.052 (0.40,0.64) 0.89
X -0.09 (-0.96,-0.8) -0.09 (-0.10,-0.08) 0.77
Response to citric acid
ΔR5(%) -2.13(-5.52,1.25) -2.51(-7.72,2.70) 0.75
ΔR20(%) -2.27(-5.48,0.94) -0.12(-4.30,4.08) 0.53
ΔR5-R20(%) -5.78(-21.7,10.17) -34.08(-68.8,0.67) 0.17
ΔX(%) 3.51(-0.64,7.65) -6.89(-15.21,1.42) 0.03*
  1. R5 resistance at 5 Hz; R10 resistance at 10 hz; × reactance; Δ, change in measurement after citric acid. Data represented as mean, with 95% confidence interval.