Background: Comorbidity measures are necessary to describe patient populations and
adjust for confounding. In direct comparisons, studies have found the Elixhauser comorbidity …

Background: Readmissions to hospital are common, costly and often preventable. An easy-to-use
index to quantify the risk of readmission or death after discharge from hospital would …

Background: Adverse events (AEs) are adverse outcomes caused by medical care. Several
studies have indicated that a substantial number of patients experience AEs before or during …

ContextPatients with nonvalvular atrial fibrillation (AF) have an increased risk of stroke and
other vascular events.ObjectiveTo compare the risk of vascular and bleeding events in …

Background— The rate of stroke in atrial fibrillation (AF) depends on the presence of comorbid
conditions and the use of antithrombotic therapy. Although adjusted-dose warfarin is …

Background Readmissions to hospital are increasingly being used as an indicator of quality
of care. However, this approach is valid only when we know what proportion of …

Background Numerous studies have tried to determine the association between continuity
and outcomes. Studies doing so must actually measure continuity. If continuity and outcomes …

Background For patients receiving therapy with oral anticoagulants (OACs), the proportion
of time spent in the therapeutic range (ie, anticoagulation control) is strongly associated with …

Emergency department (ED) overcrowding is a common problem. Despite a widespread
belief that low hospital bed availability contributes to ED overcrowding, there are few data …

Objective.—Laboratory utilization has steadily increased, and some studies suggest
inappropriate utilization. Therefore, we wished to assess studies that measure inappropriate …