managing clinical data using redcap managing clinical data using redcap peter e. gabriel, md andrew...
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Managing Clinical Data Using REDCap
Peter E. Gabriel, MDAndrew J Cucchiara, PhD
October 11, 2012
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The Research Database Problem
• The 27-version Excel spreadsheet…• The Access database created by the summer
intern…• Paper surveys…• Hard drive crashes…• The statistician’s blues…• Sharing data outside Penn…• Security? Privacy? Audit trails? Oh my!
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The REDCap Solution• Research Electronic Data Capture– Web-based, user-friendly database system, originally developed
at Vanderbilt University• Now overseen by the REDCap Consortium: 473 institutional
partners in 48 countries
– Supports concurrent access by multiple users from anywhere via web browser
– Robust data integrity, nightly backups, etc.– Excellent security and privacy features, with extensive audit
logging• HIPAA-compliant, 21 CFR Part 11 capable
– Easy to export data to Excel and statistical packages– Supports surveys, ad-hoc reporting, event scheduling, file sharing,
auto- data validation, branching logic, calculated fields, and more
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Accessing REDCapUPHS: https://redcap.med.upenn.eduCHOP: https://redcap.research.chop.edu
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Agenda• Creating and Managing Projects• Building Data Collection Forms• Entering Data• Controlling User Access Rights• Ad Hoc Reports and Exporting Data• (Advanced Tools)
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Creating a New Project
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Enter Project Title:
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Select a Project Purpose
Only used to track usage statistics – does not affect functionality
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Select a Project Type & Collection Format
• Key Question:Is REDCap right for your project?
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REDCap Project Types
• Single Survey• Ideal for collecting anonymous, one-time responses from
participants – similar to a basic SurveyMonkey survey• Participants are emailed a link that points to a web form in order
to collect responses; they do not need to have a REDCap account
• Data Entry Forms• Intended for data capture by clinicians with a REDCap account
• Single Survey + Data Entry Forms• Can be used to initially populate records with participant
responses in order to initiate data collection (example: pre-screening survey)
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Data Entry Collection Format
• Classic Data Collection• Data to be collected once per subject – i.e. one
“record” per subject
• Longitudinal/Repeating Collection• Data collected multiple times per subject– Fixed number of collection points that correspond to pre-
defined events, e.g. Initial Evaluation, 3mo. follow-up, 6mo. follow-up, 1yr follow-up
• Optional scheduling via project calendar
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A Brief Word on Data Relationships
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• One-to-many and many-to-many relationships are common in healthcare data– E.g. one patient can have many diagnoses, procedures,
medications, lab results, etc.• Data sets containing these complex relationships may
need to be restructured in order to work with REDCap• Example:
Study ID Dx Code Medications Hgb A1c Hgb A1c Date1 250.00 Metformin 5.2 11/2/2005
Sulfonylurea 6.4 3/1/20107.6 7/5/20127.2 10/3/2012
2 250.02 Insulin 8.0 10/24/2011Metformin 8.2 4/13/2012
This will not work in REDCap as structured.
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Options for Restructuring Data
• Convert multi-valued data fields into a series of “yes/no” fields– Example: Aspirin Yes/No? Beta blocker Yes/No?
• Summarize your longitudinal data points into aggregate statistics over a fixed time period and use “Classic” collection format– Example: Min Hgb A1c, Max Hgb A1c, etc.
• Align your longitudinal data points with pre-defined events and use “Longitudinal” collection format– Example: Pre-Treatment PSA, 6-month post-treatment
PSA
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Restructuring Data - Examples
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• …restructured to be “flat:”
• Complex data with many-to-many relationships…
Study ID Dx Code Insulin Metformin SulfonylureaMax Hgb
A1cMax Hgb A1c Date
1 250.00 No Yes Yes 7.6 7/5/2012
2 250.02 Yes Yes No 8.2 4/13/2012
3 250.00 No Yes Yes 8.7 6/2/2012
4 250.42 Yes No No 9.6 8/16/2012
Study ID Dx Code Medications Hgb A1c Hgb A1c Date1 250.00 Metformin 5.2 11/2/2005
Sulfonylurea 6.4 3/1/20107.6 7/5/20127.2 10/3/2012
2 250.02 Insulin 8.0 10/24/2011Metformin 8.2 4/13/2012
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Restructuring Data - Examples
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• …restructured to be “event-based:”
• Complex data with many-to-many relationships…
Study ID Event Dx Code Insulin Metformin Sulfonylurea Hgb A1c
3 Initial Eval 250.00 No Yes Yes 8.6
3 3 Mo. F/U No Yes Yes 8.4
3 6 Mo. F/U Yes Yes No 8.0
3 1 Yr F/U Yes Yes No 7.4
Study ID Dx Code Medications Hgb A1c Hgb A1c Date1 250.00 Metformin 5.2 11/2/2005
Sulfonylurea 6.4 3/1/20107.6 7/5/20127.2 10/3/2012
2 250.02 Insulin 8.0 10/24/2011Metformin 8.2 4/13/2012
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Creating a New Project
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Enter Project Title:
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Project Setup
Nav
igati
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CenterWorkArea
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Project Setup
These buttons are only a “to-do list” for your benefit – they do not control project functionality
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Project Setup
We just did this when we created the project – click here if you need to go back and change the format again
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Project Setup
Advanced settings – more on these later
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Project Setup
Copying, archiving, and deleting a project
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Project Setup
Best way to get started building forms
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Data Collection Instruments
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• An instrument is a single data entry form• A subject has exactly one record across all data entry
forms – i.e. all the data fields eventually combine into one big row per subject in the exported data
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Data Collection Instruments (cont.)
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• So why have more than one instrument?– Logical grouping of related data fields– Can control user access at the instrument level – e.g. a
data entry assistant can be restricted from seeing the demographics form that contains PHI
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REDCap Shared Library
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• The REDCap Shared Library can be a good source for standardized instruments, e.g. CDASH, SF-36, FACT-G, etc.
• Content will hopefully grow over time
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Data Collection Instruments
• Click instrument name link to:– Modify an existing form– Add additional fields to form– Modify existing questions– Change attributes of questions
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Online Designer
• Data Fields• Add New Field
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• Section Header• Preview Button
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Data Field Operations
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A Note on the Study ID Field
• The first data field in every project is the unique record identifier for that project
• Default variable name is “study_id” but you can rename it to something else
• Can be a “real” ID like MRN or SSN, or a randomly-assigned number. Must be unique.
• Can set it to be auto-assigned by REDCap (Project Setup Make customizations Use auto-numbering for naming new project records)
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Creating / Editing a Data Field
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Field Types
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Defining the Field Attributes• Variable Name
– Unique data column name
• Validation– Data type/format constraints
• Required– Mandatory field
• Identifier– Mark as an identifier (PHI)
• Custom Alignment– Question arrangement
• Field Note– Additional instruction for data entry
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Variable Name Requirements• Should be descriptive (i.e. not cryptic as with a1, xyz, lol). The
variable name is how analysis data is referenced.
• The first character of a variable name must be an alphabetical character (i.e., A to Z or a to z).
• All other characters of a variable name may contain alphabetical characters, numbers 0 to 9 or underscores (i.e., spaces, punctuation marks, mathematical functions, special characters and symbols are NOT allowed).
• Length of variable names should contain fewer than 26 characters; shorter variable lengths are better to reduce the risk of truncation by statistical analysis packages.
• Variable names must be unique among all instruments (i.e. forms) within a specific REDCap Project.
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Text Field Validation
• Verifies data input to prevent invalid entry, prior to form submission
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Required Fields
• Required fields are labeled with *must provide value
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• Warning prompt when trying to save:
Not a “hard stop” - possible to override
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“Identifier” Fields
• Fields that constitute protected health information (PHI) can be marked as an “Identifier.”
• These fields can then be excluded on data export, allowing for analysis of “de-identified” data
• Users can also be restricted in their ability to export Identifier fields based on access rights
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Custom Alignment Examples
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• Custom Alignment controls the position and orientation of the responses on data entry forms.
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Permissible Values for Multiple Choice Fields
• A value (1 to n) is automatically assigned to each choice when the field is saved:
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• Can also manually code values yourself by entering ‘# , text description’
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Creating a Conditional Field
• Branching logic can be used to show fields that meet a certain condition
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Creating a Conditional Field (cont.)
• Specify the variable and value of the field that makes the condition true
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• Complex AND / OR / NOT logic is possible is possible with the “Advanced Branching Logic Syntax” (vs. the “Drag-N-Drop Logic Builder”)
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Creating a Conditional Field (cont.)
• The field containing branching logic will show/hide based on the value of the field(s) it depends on
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Agenda• Creating and Managing Projects• Building Data Collection Forms• Entering Data• Controlling User Access Rights• Ad Hoc Reports and Exporting Data• (Advanced Tools)
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Starting Data Collection• The Data Collection area of the
navigation pane, lists all the forms (aka instruments) available for the project
• In order to create a new record, the form that contains the Study ID must be entered first.
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Creating a New Study ID
• A new record is created whenever a non-existing identifier is entered on the first page of the data collection interface.
• If the record already exists then the record for that Study ID is retrieved.
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1234567
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Using an Existing Study ID
• An existing Study ID can also be selected from the appropriate dropdown list on the first page of the data collection interface.
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Form Status• All collection forms (aka instruments) have a “Form Status” field
at the end of the form• There are three possible record statuses:
– Incomplete– Unverified– Complete
• “Save Record” saves and exits the record• “Save and Continue” saves and opens the next collection form if
there is one, or saves and keeps the current record open if not
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Viewing the Edit History
• To view the edit history for a particular field, click the “H” icon next to the field:
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User Rights and Permissions
• Allows you to grant a user full or partial access to the project
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Granting User Privileges
• Basic user rights include access to various modules and ability to export PHI
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Granting User Privileges
• Ability to lock a particular record from further editing
• Ability to Create / Rename / Delete project records
• Data Entry Rights are specified individually for each data collection form
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Data Access Groups• Data Access Groups is an advanced feature useful for
multi-center trials and collaborations• Users in a particular Data Access Group can only see
records entered by other users in that Data Access Group
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Ad-Hoc Reporting
• “Report Builder” allows you to run simple queries within REDCap
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Ad-Hoc Reporting (cont.)
• “Graphical Data View & Stats” provides some simple statistics for every field in a particular data collection instrument
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Data Export• Simple Data Export can be used to export an entire project
data set• Advanced Data Export allows you to select specific fields and
de-identify the data set if desired
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Data Export – De-Identification Options
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Data Export – Available Formats• Can export to comma-separated values (.csv) format
and a variety of statistical package formats
• For Excel export, “Raw” option includes variable names as column headers; “Labels” includes descriptive field names
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Advanced Features
• Customizing project settings• Creating and managing forms and data fields using
the downloadable “data dictionary”• Importing data• Data Quality module• File Repository• Event Log
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Resources Beyond This Course• [email protected]• Andy Cucchiara ([email protected], 215-662-2293)• Pete Gabriel ([email protected], 215-615-3437)• Join CHOP/UPenn REDCap Users’ Group Meetings– Usually first Wednesday each month– Physically attend at 3535 Market St– Virtually attend via ‘GoToMeeting’
• REDCap Help & FAQ, Training Resources: