A group report allows you to get an in depth overview of how your subscribers are interacting with your campaigns. To see the stats of the specific group, go to Subscribers. Click the name of the specific group and the Group Stats tab.
At the top of the page, you will see the average stats for open rate, click rate, subscribe rate and more. Below you will have stats such as: your list growth, subscriber engagement and reading environment. This last option shows how many view your newsletters in a web browser or on a mobile device.
At the bottom of the page, you will see the most popular domain names used by your subscribers. On top of that, you will also get an overview of the most popular email clients.