Filters

Filters can be used to further specify cohorts. They are available in the encounter overview page. For example:

https://github.com/JRC-COMBINE/DEA/blob/main/img/encounter_filter.png

Above screenshot shows three filters: “Short Stay”, “Severe ARDS” and “Many Measurements”, with “Short Stay” active on the test data. With tags set up for the same criteria we can quickly verify the filters working correctly.

How to define filters?

To add a filter append name and function to the FILTERS variable in dea/app.py. The filter function is called for every encounter and should return a boolean indicating whether to include the encounter or not.

For example, if you want to run a study only on patients that are called “Boris” you could set up a Boris filter like this:

FILTERS = {
    "Short Stay": filter_short_stay,
    "Severe ARDS": filter_severe_ards,
    "Many Measurements": filter_many_measurements,
    "Boris": lambda encounter: encounter.patient.name == "Boris"
}

The filter will automatically create a new button in the filter section of the encounter overview page. Customizing the visualization of the filters can be done by changing the template in dea/templates/encounter_list.html.