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

Fig. 3. p control chart showing percent of babies in cohort population with severe BPD at 36 weeks corrected gestational age.

Fig. 3

Solid red = centerline (mean). Dashed blue = points used for baseline calculation. Dashed red = control limits. Dashed green = goal. Shifts meet ASQ rules (April 2013 = 10 out of 11; April 2014 = 10 out of 11; June 2016 = 8 in a row; December 2017 = 8 in a row). 12 points were used to calculate all centerlines. Centerlines starting in mid-2013 are 57%, 29%, 40%, and 21%. (Color figure online).