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. 2020 Jan 6;40(4):681–687. doi: 10.1038/s41372-019-0574-8

Fig. 2. p control chart showing percent of babies with any BPD at 36 weeks corrected gestational age.

Fig. 2

Solid red = centerline (mean). Dashed blue = points used for baseline calculation. Dashed red = control limits. Dashed green = goal. Shifts meet ASQ rules (January 2013 = 12 out of 14; November 2017 = 8 in a row). 12 points were used to calculate all centerlines. Two other special cause signals are indicated by red points: August–November 2014 = 2 out of 3 in outer third of control limit; September 2015–September 2016 = run which meets rule for statistical significance without meeting “traditional” SPC rules (see Wheeler et al. [17]). Centerlines are 52%, 73%, and 41%. (Color figure online).