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Developing the Minimum Dataset for the New Mexico Decedent Image DatabaseFunding This study is funded by National Institute of Justice 2016-DN-BX-0144.
Background A minimum dataset (MDS) can be determined ad hoc by an investigator or small team; by a metadata expert; or by using a consensus method to take advantage of the global knowledge and expertise of a large group of experts. The first method is the most commonly applied.
Objective Here, we describe a use of the third approach using a modified Delphi method to determine the optimal MDS for a dataset of full body computed tomography scans. The scans are of decedents whose deaths were investigated at the New Mexico Office of the Medical Investigator and constitute the New Mexico Decedent Image Database (NMDID).
Methods The authors initiated the consensus process by suggesting 50 original variables to elicit expert reactions. Experts were recruited from a variety of scientific disciplines and from around the world. Three rounds of variable selection showed high rates of consensus.
Results In total, 59 variables were selected, only 52% of which the original resource authors selected. Using a snowball method, a second set of experts was recruited to validate the variables chosen in the design phase. During the validation phase, no variables were selected for deletion.
Conclusion NMDID is likely to remain more “future proof” than if a single metadata expert or only the original team of investigators designed the metadata.
Protection of Human and Animal Subjects
We received Institutional Review Board approval from the University of New Mexico Human Subjects Research Review Committee on June 10, 2013 (Human Research Protections Office13–229).
Received: 25 January 2021
Accepted: 30 April 2021
Article published online:
02 June 2021
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