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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 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 I²= 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 I²= 73%. SD: standard deviation; IV: inverse variance; CI: confidence interval; WMD: weighted mean difference; eCO: exhaled carbon monoxide.