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. 2005 Jun 4;330(7503):1309–1313. doi: 10.1136/bmj.330.7503.1309

Fig 3.

Fig 3

Time from registration at the outpatient clinic to start of chemotherapy. Time measurements were plotted as a run chart. Control limits (dotted blue lines) were calculated as: upper/lower control limit=mean waiting time±(2.66×average point to point variation—that is, moving range). Dotted green lines represent average waiting times