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Night-time cough score. Night-time cough score measured at different times (day 0 and day 4) in patients enrolled for both study product and placebo groups. Means (black dots) and corresponding standard deviations show a significant decrease in mean night-time cough score for the study product group among time (T-test, ** p = 0.003), and a significant difference of mean night-time cough score between study product and placebo groups at t4 (T-test, * p = 0.03).
