Figure 5From: A comparison of continuous and bi-level positive airway pressure non-invasive ventilation in patients with acute cardiogenic pulmonary oedema: a meta-analysisForest plot: effect of BiPAP and CPAP on length of hospital stay. BiPAP, bi-level positive airway pressure; CI, confidence interval; CPAP, continuous positive airway pressure; WMD, weighted mean difference.Back to article page