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. 2011 Nov 4;19(3):328–333. doi: 10.1136/amiajnl-2011-000394

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© 2012, 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.

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Study design. Exclusions, case–control matching, study cohorts, and analysis. *‘No-HIE’ records were matched on age, gender, race, payer, presenting diagnosis, and site of care. †Exclusions: case and control were same patients (932); case records were from non-ED settings (3555). Seventeen records (0.1%) had time stamp errors but were retained for regression analyses. ED, emergency department; HIE, health information exchange.