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Figure 4 Association between any individual clinical condition present in the study population and variations in endothelial progenitor cell (EPC) and circulating progenitor cell (CPC) levels. Only PVD was associated with significantly reduced EPC numbers, while pathologic AER and microvascular complications had no effect on levels of EPCs and CPCs. Mean values ± SE. AER = albuminuria excretion rate >30 mg per 24 h; CRF = chronic renal failure; NS = not statistically significant.