Table 2. Face Mask Fitted Filtration Efficiency (FFE) Against Submicron Particle Penetration.

Face mask	% FFE (SD)a
	Man	Woman
3M 1860 N95
Small	91.1 (4.0)	98.6 (0.4)
Regular	98.4 (0.5)	93.1 (1.6)
3M 8210 N95 (one size only)b	99.4 (0.3)	98.2 (0.7)
3M 8511 N95 with exhalation valveb	98.1 (0.7)	98.3 (0.9)
Surgical mask
With ties	69.8 (5.1)	68.9 (10.9)
With ear loops	39.7 (10.5)	26.5 (14.0)

^a The FFE percentage corresponds to the mask condensation particle counter counts/ambient condensation particle counter counts × 100. The FFE percentage and SD were calculated across the length of the test.

^b Mask functioned at or above 95% FFE.