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. 2022 Feb 1;11(1):e001343. doi: 10.1136/bmjoq-2021-001343

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© Author(s) (or their employer(s)) 2022. Re-use permitted under CC BY-NC. No commercial re-use. See rights and permissions. Published by BMJ.

This is an open access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited, appropriate credit is given, any changes made indicated, and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/.

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Compliance with low tidal volume ventilation (LTVV) in the Presbyterian coronary care unit (CCU). Statistical process control charts illustrating changes in LTVV over time in the Presbyterian CCU, which did not actively participate in the quality improvement project. Per cent of mechanically ventilated ICU patient days with LTVV compliance is charted on the y-axis and time is charted on the x-axis. Horizontal light dashed lines represent the upper and lower confidence limits. Dark dashed lines represent the centre line. Red diamonds represent unstable trends. Blue diamonds represent stable trends.