Fig 2. Number of circulating endothelial microparticles (EMPs), progenitor cells (PCs) and the ratio EMPs/PCs in nonsmokers, current smokers, ex-smokers with COPD and current smokers with COPD.

Number of (A) CD31⁺CD42b^- EMPs expressed per μL of poor platelet plasma (PPP), (B) CD34⁺CD133⁺CD45⁺ labelled cells expressed as percent of lymphomonocytes and (C) CD31⁺CD42b^- EMPs/ CD34⁺CD133⁺CD45⁺ PCs expressed as the ln. The whiskers extend from the box to the 90^th and 10^th percentiles. Kruskal-Wallis One Way Analysis of Variance on Ranks.