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. 2018 Oct 21;7(4):e000385. doi: 10.1136/bmjoq-2018-000385

Figure 2.

Figure 2

An individual values control chart showing the number of current problems (CP) per discharge document over time. PDSA cycles are shown on the x axis. The mean and control limits are recalculated whenever a process change is indicated by special cause variation. PDSA, Plan-Do-Study-Act.