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. 2013 Aug 23;20(e2):e311–e318. doi: 10.1136/amiajnl-2013-001922

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Published by the BMJ Publishing Group Limited. For permission to use (where not already granted under a licence) please go to http://group.bmj.com/group/rights-licensing/permissions

This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 3.0) 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 and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/3.0/

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Comparison of profiles of lagged linear correlation with five healthcare (HC) events for partial thromboplastin time (PTT) and international normalized ratio (INR). Each graph shows the lagged linear correlation curve for a concept–healthcare event pair. In each graph, the horizontal axis covers –60 to +60 days with 0 days at the midpoint, and the horizontal line represents a correlation of zero with positive correlation above the line. The profiles are well matched for INR and PTT. ED, emergency department.