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Annals of Intensive Care
Fig. 2 | Annals of Intensive Care

Fig. 2

From: Noninvasive ventilation with helium–oxygen mixture in hypercapnic COPD exacerbation: aggregate meta-analysis of randomized controlled trials

Fig. 2

Effects of He/O2 mixture on NIV failure rate. Blue squares represent odds ratios (ORs) in individual trials with the size proportional to the weight of the study. The 95% confidence intervals (CIs) for individual trials are denoted by lines. The contribution of each included study to the pooled estimate (weight) is plotted as a percentage in the right column. The combined overall effect is represented by the red diamond

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