The first type of event comparison allows the identification of events in the local database having one or more data elements in common, such as the same risk index. This type of comparison is called a Query by Field.

The Query by Field tool will allow submission of values for one or more data elements included on the three on-line event reporting forms. The output is a "clickable" list of events accession numbers. These "matching" events can then be further examined and compared as needed.