TABLE 3.

Missed Versus Predicted Missed Days of School for Students and Staff throughout Entire Study Period among Enrolled Participants^a in Optionally Masked Districts: Data from November 29, 2021 to January 28, 2022

Study Period and Participants	Observed Missed Days	Predicted Missed Days Without TTS	Proportion of Saved Days (%)
11/29/2021–1/28/2022 (Delta and Omicron)
Elementary school	410	3344	88
Middle school	295	2601	89
High school	229	2233	90
Administrationb	0	15	100
Unknown/multiple levels	0	13	100
Total	934	8206	89
1/3/2022–1/28/2022 (Omicron)
Elementary school	257	1658	85
Middle school	178	1124	84
High school	95	850	89
Administrationb	0	15	100
Unknown or multiple levels	0	13	100
Total	530	3660	86

^aStaff were categorized based on the school-level associated with their work.

^bAdministration refers to physical work in an administrative office rather than within a school level.