Is it possible to get a list of users by trust level?

Hi, sorry for resurrecting this (but I thought that is better than making a new topic):
how can I see which users are ONLY in Level 0? All level 1 users are also listed as level 0 users, which is not interesting info IMO. I want to find those few people who are stuck in level 0 and reach out to them, without needing to crossreference the lists of 1 vs 0 manually.