Table 2.

Fast test (1 min and 2.5 min) vs. Chinese standard testing procedures (6 min).

Mask type/Parameter	1 min fast test	2.5 min test	6 min test	p value (2.5 vs 6)	p value (1 vs 6)	p value (1 vs 2.5)
D918 mask (n = 54)
Total FF	200[66, 200]	154[65, 200]	163[81, 200]
Passing Rate, n (%)	53(98.15%)	44(81.48% [95%CI, 0.69 to 0.90])	41(75.93% [95%CI, 0.63 to 0.85])	0.371	0.003	0.016
Failed FF	66[66, 66]	76[65, 94]	93[81, 98]
D920 mask (n = 54)
Total FF	200[17, 200]	200[58, 200]	200[116, 200]
Passing Rate, n (%)	52(96.30%)	51(94.44% [95%CI, 0.85 to 0.99])	50(92.59% [95%CI, 0.82 to 0.97])	1.0	0.480	1.0
Failed FF	48[17, 79]	58[58, 58]	–†

FF = Median [min, max], each participant was tested twice, resulting in a total of 108 observations across the two mask types.

^†Four participants failed the 6‑min test with the D920 mask; their specific Fit Factor values were not recorded by the device.