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. 2021 Mar 23;41(6):1487–1494. doi: 10.1038/s41372-021-01033-6

Fig. 2. Significant decreases in non-indicated platelet transfusions after project start on SPC analysis.

Fig. 2

Special cause variation shows significant change. A Decreased number of non-indicated platelet transfusions/month after project start from 7.3 to 1.6 on SPC C-chart analysis. B Rate of non-indicated transfusions per 100 patient admissions decreased from 12.5 to 2.9 after project start on U-chart analysis. For both A and B, the rule used to determine special cause variation was 8 or more points below the centerline.