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Figure 4 | Respiratory Research

Figure 4

From: Exhaled carbon monoxide in asthmatics: a meta-analysis

Figure 4

eCO levels in childhood and adult asthma. The WMD of eCO levels between asthmatic children and healthy children is 0.95 ppm (95%CI: 0.65 to 1.24) using the random effects model. Test for heterogeneity I 2 = 59%. The WMD of eCO levels between asthmatic adults and healthy adults is 1.49 ppm (95%CI: 0.84 to 2.14) using random effects model. Test for heterogeneity I 2 = 73%. SD: standard deviation; IV: inverse variance; CI: confidence interval; WMD: weighted mean difference; eCO: exhaled carbon monoxide.

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