Some school districts answered survey questions in ways that made it necessary to recategorize their responses from 2017. These districts and the accompanying revisions are listed below:
- Williamston Community Schools clarified that in 2017, its school used contract custodians only to serve on an occasional and temporary (substitute) basis. As such, it should not have been tallied in the survey.
- Bois Blanc Pines School corrected that it did not contract out custodial services.