Fig. 3.

Five heterogeneous studies reporting cough severity via the Bronchitis Severity Scale (BSS) in four cases and a modified BSS (mBSS, wheezing instead of sputum assessed) in one case. Intervention groups are represented by a diamond shape and placebo groups by a circle. A combined circle and diamond shape depicts the BSS for a noninferiority study which combined data for the intervention and comparator groups. The populations of non-randomized studies are represented by squares; text within the squares indicates which comedication was allowed