Emergency Department (ED) Disability Diagnostic Tool

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01416857
Recruitment Status : Completed
First Posted : August 15, 2011
Last Update Posted : July 9, 2014
Agency for Healthcare Research and Quality (AHRQ)
Information provided by (Responsible Party):
Yale University

August 11, 2011
August 15, 2011
July 9, 2014
August 2011
March 2014   (Final data collection date for primary outcome measure)
the presence/absence of at least one visit to the ED, hospital admission or death within 90 days of the initial ED visit. [ Time Frame: 90 days ]
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Complete list of historical versions of study NCT01416857 on Archive Site
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Emergency Department (ED) Disability Diagnostic Tool
ED Disability Diagnostic Tool: a Health Information Technology Feasibility Study

Aim 1: To develop and validate an Emergency Department(ED) Rasch Disability Diagnostic Tool (RDDT).


  • Rasch modeling will provide an instrument with better measurement properties, including increased reliability and validity compared to currently available ED measure of disability (MOD).

Aim 2: To conduct a randomized controlled trial to evaluate the utility of the ED-RDDT to reduce rehospitalizations in Medicare recipients visiting an urban Emergency Department for non-traumatic illness


  • Compared to the standard screening tool, the ED RDDT will reduce reutilization of the hospital (ED visits, hospital admissions, or death) within 60 days of discharge.
  • The ED RDDT will reduce costs to Medicare, hospitals and patients.
Research Overview - The overarching aim of this study is to improve health outcomes for patients presenting to EDs by modifying and testing a disability diagnostic tool. The investigators expect a more accurate and precise tool will lead to better discharge plans and referrals for ED patients, reduce morbidity and mortality, and reduce unnecessary hospital visits and costs. The investigators will develop the core set of indicators with face (logical) validity from our research team of disability, emergency medicine, and geriatric medicine experts and practitioners. These experts will choose which pieces of information need to be included and group the selected pieces of information into content areas. Each content area will contain pieces of information that measure the same unidimensional concept. The investigators go through a series of Rasch analyses to establish which sets of information are in fact unidimensional and form usable scales. The investigators will test the validity of this preliminary version of the RDDT on existing hospital data by using it to predict health outcomes. Finally the investigators will consult the panel of experts to determine which information items, if any, are essential and missing from each content area. If there are such items they will be added to the RDDT. As described in the Preliminary Studies section, previous measures of disability were used for persons in long term care (LTC) and thus, need to be validated for use in the ED. The retrospective analysis will determine which indicators have superior measurement properties for use in the ED, plus, the retrospective analyses will link ED patient disability to health outcomes a necessary external validation step. A modified RDDT will be used in the prospective phase of the study. As lengthy diagnostic tools are neither feasible nor practical in the ED, Rasch scales are more useful in that subsets scale well and retain their measurement properties that remain accurate and precise. The investigators will conduct a randomized clinical trial (prospective phase) allocating patients into the study arm utilizing the RDDT (new tool) to compare with the control arm (standard care using MOD) to determine which measure is more accurate and precise as a measure of disability. There are both retrospective and prospective aspects to this multi-methodological interdisciplinary study.
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Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Diagnostic
Disability Diagnosis
Other: RDDT
  • No Intervention: MOD
    Group evaluated using the currently available ED measure of disability (MOD)
  • Experimental: RDDT
    Group will be evaluated using ED Rasch Disability Diagnostic Tool (RDDT)
    Intervention: Other: RDDT

*   Includes publications given by the data provider as well as publications identified by Identifier (NCT Number) in Medline.
March 2014
March 2014   (Final data collection date for primary outcome measure)

Inclusion Criteria:

  • Patients who present to the adult ED at the Yale New Haven Hospital (YNHH)
  • 65 years or older
  • Medicare recipients
  • Community dwellers.

Exclusion Criteria:

  • Patients and their guardians will be excluded for the following reasons:

    1. Non English speaking
    2. suffering from a condition that precludes interview i.e. communication impairment
    3. unable to provide two contact numbers for follow-up
    4. presenting with acute psychosis or are suicidal.
Sexes Eligible for Study: All
65 Years and older   (Older Adult)
Contact information is only displayed when the study is recruiting subjects
United States
1R01 HS0184120-01A1
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Yale University
Yale University
Agency for Healthcare Research and Quality (AHRQ)
Principal Investigator: Lori A Post, PhD Yale University School of Medicine, Emergency Medicine
Yale University
July 2014

ICMJE     Data element required by the International Committee of Medical Journal Editors and the World Health Organization ICTRP