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The Antitussive Effect of Placebo Treatment on Cough Associated With Acute Upper Respiratory Infection

Patrick C. L. Lee, PhD, Mutaz S. M. Jawad, MD, J. David Hull, PhD, Will H. L. West, PhD, Kerry Shaw, MSc and Ron Eccles, PhD

From the Common Cold Centre (P.C.L.L., M.S.M.J., R.E.), Cardiff School of Biosciences, Cardiff University, Cardiff, UK; and Procter and Gamble Technical Centres Limited (J.D.H., W.H.L.W., K.S.), Surrey, UK.



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  		Figure 1. Changes in cough frequency per 15 minutes (posttreatment –pretreatment) for each patient in the "no-treatment" and placebo treatment groups.

 


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  		Figure 2. Median cough frequency (per 15 minutes) pretreatment and posttreatment. Open symbols represent the "no-treatment group" and filled symbols the "placebo treatment group."

 




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