From a Columbia Journalism Review story by Ariana Pekary headlined “On media diets, partisan filtering, and getting uncomfortable”:

In late 2020, David Broockman and Josh Kalla, both political science professors, conducted what they later termed “a field experiment with Fox News viewers.” Broockman and Kalla gathered an initial pool of registered voters who regularly watched Fox News (between 500 minutes and 14,400 minutes per month) and rarely watched CNN (less than 30 minutes per month). They winnowed that pool to roughly 800 people who, taken together, self-reported watching 14 hours of Fox News each week. Of those people, ninety percent voted in the 2016 general election, and 92 percent self-identified as Republican.