Fig. 4

Statistical control chart demonstrating that optimization improved the reproducibility of PSC isolation and confirming that both the UCLA and UK isolation processes are under statistical control. A Levey-Jennings chart depicting individual data points for PSC yield (×10⁶) obtained from 100 ml of lipoaspirate using the UCLA isolation process, before and after optimization, as compared with the UK process (n = 131). The central green line represents the general mean and is delimited by upper and lower control limits (red lines) based upon a 3σ interval. PSC perivascular stem cell, SD standard deviation, SVF stromal vascular fraction, UCLA University of California at Los Angeles (Color figure online)