Figure 4From: Surfactant therapy for acute respiratory failure in children: a systematic review and meta-analysisMeta-analysis of trials of surfactant in children with acute respiratory failure: Duration of mechanical ventilation. ALI, acute lung injury; ARDS, acute respiratory distress syndrome; 95% CI, 95% confidence interval; RSV, respiratory syncytial virus; SD, standard deviation; WMD, weighted mean difference.Back to article page