DAX: Classifying employees based on outcome of measure

I'm trying to classify employees by how many times they've called in sick in a given time period. I already have a measure which calculates the number of times an employee calls in sick in a given context. Below is a rough sketch of what I want the result to look like:

The data set I have has the date of calling in sick as well as the date the employee started working again (given that they have recovered already) for each date that the given employee is employed (so it also shows days that an employee is not sick) example below.

So for the above example I want employee 1 to be classified as "2" if I look at this entire year, however if I drill down to the months I want employee 1 to be classified as "1" in both january and february.

Does anyone know if and how this can be done?

I'm using Visual Studio 2017 SSAS Tabular.

Please tell me if something is not clear :).