Antibiotics v placebo for outcomes of acute bronchitis measured by ≥4 trials

OutcomesNumber of trialsWeighted mean decrease (95% CI)
* Not significant.
† Heterogeneity existed among these studies.
Days of purulent sputum60.4 d (-0.1 to 0.8)*
Days of cough40.5 d (-0.1 to 1.1)*†
Days off work60.3 d (-0.6 to 1.1)*†