We would like to request review and discussion on the below three topics that the THEMIS group #3 (Generic, Drug, Condition, Era) is working on.
Topics #1 and #3:
#1 - Low quality records, e.g. CPRD “up to standard” flag.
- Some databases have flags for lower quality records (e.g. CPRD). In some cases researchers are interested in using the information contained in these records. THEMIS needs to decide what the standard should be for dealing with these records during ETL.
•#3 - Start Date before Observation Period.
Option 1: Continue to kick out records
Option 2: Store in “history of”
Option 3: THEMIS Focus Group 2 has proposed an idea of multiple overlapping observation period records, noted here http://forums.ohdsi.org/t/observation-period-flavors-themis-focus-group-2/3850
- In summary, there would be a different observation period for each standard type of observation.
Claims data: medical coverage observation period, prescription drug coverage observation period, both medical and prescription drug coverage period.
EHR data: data collected during patient visit at data cut points (aka referred to as "network" in the forum post) and all relevant data for patients seen at data cut points (aka referred to as "out of network"). We can wordsmith this.
A patient could have multiple types observation periods, with different time windows. Analysts will choose which observation period to use at the time of doing the study (whichever one meets their analysis plan).
Use cases for low quality records
End Date – same day issue.
- Option 1: Special times (0.00 and 23.59)/Blank
- Other Options?