Table 1. Student absences January 25 –March 11, 2016.

	Control		Humidified
Category of Absence	% out	Total Attendance	% out	Total Attendance
General	9.17	1788	8.37	2293
Sick	1.29	1788	1.00	2293
ILI	0.39	1788	0.13	2293

Total attendance is the number of students enrolled in control or humidified classrooms multiplied by the total school days during sample collection. % out for general indicates students gone for all reasons (sickness, ILI, vacation) divided by total attendance. % out sick represents students who were not in class due to expressed illness divided by total attendance. % ILI out indicates that student had self-reported symptoms of fever plus cough or fever plus sore throat. Statistical analyses not run due to small sample sizes of absences.