High rates of observed face mask use at Colorado universities align with students’ opinions about masking and support the safety and viability of in-person higher education during the COVID-19 pandemic

Table 2 Observed overall counts and percentages of persons wearing face masks indoors and outdoors and wearing face masks indoors and outdoors correctly between various campus environments; Feb. 15–Apr. 11, 2021.

CU Boulder	Total Observed		On Campus		Nearby, Off Campus
Indoors	1,299		1,299
Mask Worn	1,274	98.1%	1,274	98.1%
Mask Worn Correctly	1,191	91.7%	1,191	91.7%
Outdoors	1,509		701		808
Mask Worn	1,218	80.7%	640	91.3%	578	71.5%
Mask Worn Correctly	1,038	68.8%	566	80.7%	472	58.4%
CSU
Indoors	3,097		3,097
Mask Worn	3,042	98.2%	3,042	98.2%
Mask Worn Correctly	2,894	93.4%	2,894	93.4%
Outdoors	128				128*
Mask Worn	96	75.0%			96	75.0%
Mask Worn Correctly	76	59.4%			76	59.4%
National Aggregate
Indoors	72,075		62,971		9,104
Mask Worn	69,504	96.4%	61,488	97.6%	8,016	88.0%
Mask Worn Correctly	64,471	89.4%	57,201	90.8%	7,270	79.9%
Outdoors	28,278		19,557		8,721
Mask Worn	24,776	87.6%	17,576	89.9%	7,200	82.6%
Mask Worn Correctly	21,767	77.0%	15,492	79.2%	6,275	72.0%

*These observations were collected on the edge of the CSU campus; however, this environment was determined to be most like “Nearby, Off Campus”.

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