When looking at who is unsubscribed to your content, it is important to know what values you have set, especially if you are integrated with a CRM system.
This article will tell you how to find out your unsubscribe values.
Hover over 'Tools' and select 'Unsubscribe'.
You now need to select the appropriate unsubscribe.
Here you can see the Unsubscribe field used and the OptIn and OptOut Values associated.