Figure 5
From: Exhaled carbon monoxide in asthmatics: a meta-analysis
eCO levels in steroid-free and steroid-treated asthmatics. The WMD of eCO levels between steroid-free asthmatics and healthy subjects is 1.39 ppm (95%CI: 0.82 to 1.95) using the random effects model. Test for heterogeneity I 2 = 91%. The WMD of eCO levels between steroid-treated asthmatics and healthy adults is 0.79 ppm (95%CI: 0.35 to 1.23) using the random effects model. Test for heterogeneity I 2 = 84%. SD: standard deviation; IV: inverse variance; CI: confidence interval; WMD: weighted mean difference; eCO: exhaled carbon monoxide.