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 Table of Contents

The Query Tool is the main panel through which users construct, refine, and submit i2b2 queries.

3.1 Layout

3.2 Building a New Query

Initially the Query Tool shows three Groups to the users, but only one (the first one) is active. Users are to add criteria via drag-and-drop to the Groups to construct their queries. A number of potential i2b2 objects can be added to the Groups. They include ontology terms, previous queries, results of previous queries, and items from the Workplace.

    i. Adding i2b2 Objects into Groups

       1) Ontology Terms

The Navigate/Find Terms panel contains all available ontologies. Users can browse or use its search functionalities to find a certain terms. After identifying the terms users wish to query for, they can drag and drop them into the Groups.

       2) Previous Query

The Previous Queries panel lists all previously submitted queries. Users may drag and drop a previous query into a Group. When a new query contains a previous query is executed, i2b2 will run the previous query first. The previous query's results are then used in conjunction with the other terms in the new query to obtain the final results. In this sense, a previous query in a query can be thought of as a sub-query.

       3) Query Result (Patient Set/ Patient)

For each previous query in the Previous Queries panel, its results such as individual patients or patient sets can also be dropped into the Groups.

       4) Including a Folder in Workplace

Workplace is a place where users can put any i2b2 objects such as ontology terms, previous queries, patient sets, etc. they wish to save for later. Users can then drag these saved objects into the query Groups. In addition,

    ii. AND/OR Operators

       Order of Precedents

    iii. How to use a lab test (terms with values)

    iv. Run Query and Clear buttons

3.4 Resetting the Query Tool (Clear)

3.5 What Happens when a query gets queued?

3.6  Rerun a Previous Query

3.7 Advanced Query Options

    i.Output Options

        1) Patient Set
        2) Encounter Set
        3) Number of Patients
        4) Gender Patient Breakdown
        5) Vital Status Patient Breakdown
        6) Race Patient Breakdown
        7) Age Patient Breakdown
        8) Timeline
        9) Length of Stay Breakdown
        10) Top 20 Medications Breakdown
        12) Top 20 diagnoses Breakdown
        13) Inpatient and Outpatient Breakdown

    ii. Managing Groups

        1) Additional Groups
        2) Shifting Group Order
        3) Delete Groups

    iii. Specifying Constraints

        1) Date Constraints  (Panel-level and Term-level)
        2) Negation (Exclude)
        3) Occurrences

    iv. Value Constraints

(e.g. "Find patients who have a systolic blood pressure reading greater than 130 mm Hg")

    v. Modifiers

        1) What are they?
        2) Has Value Constraints like Labs
        3) How are they represented in Navigate/Find Terms
            - Modifier
            - Modifier Container

    vi. Query Timing

        1) Treat all groups independently (default)
        2) Select Groups occur in the same financial encounter
        3) Define sequence of events (Temporal Query)
            - Simple
            - Advanced
            - Some Concepts do not make sense here (Put them in the Population )

3.8 Example Queries

  i. Simple Query: "Finding patients with a diagnosis A or a diagnosis B or has lab test C."

  ii. Running a Previous Query

  iii. Temporal Query (Simple)

  iv.  How to find Patients with >1 diagnosis X OR >1 diagnosis Y  (Using nested queries)

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