April to June 2020: Project Initiation
- Obtained University of Wisconsin (UW) IRB Exemption approval for project
- Identified discrete EHR data elements of interest (about 250 elements), all of which are HIPAA-compliant and de-identified (per HIPAA requirements)
- Provided a unique de-identified patient identifier for each patient included in the cohort. The unique identifier allows for tracking of additional treatments provided by the same health system after the initial COVID diagnosis
- Completed data transfer and use agreements with each of the 21 health systems
- Contracted with BlueTree to consult on use of EHR data
- Defined a COVID-19 case as PCR+ for COVID and/or ICD-10 Code for COVID and/or Antibody+ for COVID
July to September 2020: Initiated Data Extraction
- Corrected and refined EHR coding across the 21 health systems
- Merged data across 21 health systems to evaluate summary data for the first time
- UW processed, merged, optimized, and harmonized data from all 21 health systems (ongoing)
October to December 2020: Produced first Analyzable Data Set Findings
- February 1, 2020 – December 31, 2020 total sample size – approximately 620,000 discrete patients with COVID-19 case
2021: Data Transformed to Limited Data Set; Additional Analyzable Data Set Findings
- Data transformed from deidentified data set to a limited data set
- February 1, 2020 – April 30, 2021 total sample size – approximately 875,000 discrete patients with COVID-19 case
CEC-UW Essentials
