40
Participants
Start Date
October 21, 2014
Primary Completion Date
November 4, 2016
Study Completion Date
November 4, 2016
Low efficiency air filtration systems
Subjects were exposed to low-efficiency filtered air.
High efficiency air filtration systems
Subjects were exposed to high-efficiency filtered air.
Air filtration systems without filters (sham)
Subjects were exposed to unfiltered air.
University of Michigan
OTHER
Michigan State University
OTHER