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. 2005 Apr 25;6(1):38. doi: 10.1186/1465-9921-6-38

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Copyright © 2005 Willemse 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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Spearman's rank correlation: Cigarettes smoked per day and percentage of macrophages in biopsies. COPD (■, ): rho = 0.69 p = 0.002 and asymptomatic smokers(□, ): rho = 0.46 p = 0.03.

Inline graphic — Spearman's rank correlation: Cigarettes smoked per day and percentage of macrophages in biopsies. COPD (■, ): rho = 0.69 p = 0.002 and asymptomatic smokers(□, ): rho = 0.46 p = 0.03.