Before revision:  We find that these design elements significantly deter interactions with opt-out mechanisms ( including reducing the opt-out rate for users who are uncomfortable with the sale of their information ) and that they reduce users' awareness of their ability to opt-out.
After revision:  We find that these design elements significantly deter interactions with opt-out mechanisms ( including reducing the opt-out rate for users who are uncomfortable with the sale of their information -- and that they reduce users' awareness of their ability to opt-out.