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. 2010 Apr 30;11(1):50. doi: 10.1186/1465-9921-11-50

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Copyright ©2010 Zhang et al; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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eCO levels in mild + moderate persistent and severe persistent asthmatics. The WMD of eCO levels between mild + moderate persistent asthmatics and healthy subjects is 0.84 ppm (95%CI: 0.48 to 1.20) using the random effects model. Test for heterogeneity I²= 62%. The WMD of eCO levels between severe persistent asthmatics and healthy subjects is 2.20 ppm (95%CI: 0.29 to 4.10) using the random effects model. Test for heterogeneity I²= 68%. SD: standard deviation; IV: inverse variance; CI: confidence interval; WMD: weighted mean difference; eCO: exhaled carbon monoxide.