Table 2. Adequate protection rate, their fit factor, and leakage rate according to N95 respirators and KF94 masks.
| Tested value | Overall | N95 respirators | KF94 masks | P value | OR | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Overall | 3M1860 | 3M9210+ | 201 | 500 | C250 | Overall | A | B | C | D | E | F | |||||
| Fit factor | 84.4 | ||||||||||||||||
| Pass rate, % (No.) | 22.7 (75) | 48.7 (73) | 70.0 (21) | 96.7 (29) | 10.0 (3) | 30.0 (9) | 36.7 (11) | 1.1 (2) | 0 (0) | 6.7 (2) | 0 (0) | 0 (0) | 0 (0) | 0 (0) | < 0.001a | ||
| Fit factor, Median (IQRs) | 9 (3.8–92.3) | 94.0 (21.5–200.0) | 160.5 (86.8–200.0) | 200 (200.0–200.0) | 11.5 (5.0–41.0) | 21.5 (10.5–179.5) | 84.0 (66.0–118.3) | 4.0 (2.0–8.0) | 3.0 (2.0–6.0) | 8.5 (4.0–26.0) | 2.0 (2.0–4.0) | 2.5 (2.0–3.3) | 6.0 (4.0–9.5) | 7.0 (4.0–15.5) | < 0.001b | ||
| Leakage rate, % | 25.3 | ||||||||||||||||
| Pass rate, % (No.) | 20.6 (68) | 42.0 (63) | 53.3 (16) | 93.3 (28) | 10.0 (3) | 36.7 (11) | 16.7 (5) | 2.8 (5) | 0 (0) | 6.7 (2) | 0 (0) | 0 (0) | 6.7 (2) | 3.3 (1) | < 0.001a | ||
| Leakage rate, Median (IQRs) | 20.9 (6.0–54.9) | 6.0 (2.3–12.5) | 4.1 (2.2–7.9) | 2.0 (0.8–3.1) | 15.4 (7.5–38.0) | 6.1 (1.3–11.9) | 7.2 (5.8–13.5) | 49.0 (23.8–73.2) | 50.7 (31.0–82.3) | 32.3 (15.9–50.1) | 60.4 (49.7–83.7) | 71.5 (62.6–91.4) | 28.7 (11.0–46.3) | 30.5 (18.4–54.6) | < 0.001b | ||
OR = odds ratio, IQR = interquartile range.
aχ2 test for comparing N95 respirators with KF94 masks; bWilcoxon signed rank test for comparing N95 respirators with KF94 masks.