Table 2.

The QNFT results of studied respirators compared to the brand 2 by the repeated measurements

Respirator code	QNFT result (n = 37)		Mean ± SD of FFs	95% CI for Mean of FFs		95th Percentile of FFs	95% CI for 95th Percentile of FFs		pa	Overall p
	Passed N (%)	Failed N (%)
				Lower	Upper		Lower	Upper
1	1(2.70)	36(97.30)	23.24 ± 27.33	16.41	34.24	61	34	170	<0.001	<0.001
2	16(43.20)	21(56.80)	110.49 ± 72.20	87.94	133.78	200	200	200	–
3	6(16.22)	31(83.78)	62.62 ± 39.33	50.59	74.38	151	101.01	160	>0.05
4	10(27)	27(73.0)	59.84 ± 52.51	43.32	76.64	180	140	180	>0.05
5	2(5.41)	35(94.59)	26.76 ± 24.09	20.16	35.03	100	50.60	100	<0.001
6	3(8.11)	34(91.89)	31.05 ± 30.46	22.16	41.51	104	54	140	<0.001
7	6(16.22)	31(83.78)	53.51 ± 47.21	39.52	70.24	155	101	200	>0.05
8	5(13.51)	32(86.49)	42.70 ± 44.01	29.24	56.81	144	100.40	180	<0.001
9	2(5.40)	35(94.59)	30.51 ± 28.28	22.17	40.51	106	60	115	<0.001
10	2(5.40)	35(94.59)	11.39 ± 22.21	5.76	19.23	100	20	100	<0.001
11	3(8.10)	34(91.89)	18.43 ± 27.60	10.73	27.43	102	25.50	120	<0.001
12	3(8.10)	34(91.89)	13.51 ± 26.17	5.89	23.40	100	10	100	<0.001
13	0	37 (100)	4.84 ± 2.46	4.08	5.62	9.10	8.10	10	<0.001
14	4(10.81)	33(89.19)	18.38 ± 29.04	10.27	28.08	100	23.50	100	<0.001
15	4(10.81)	33(89.19)	24.70 ± 31.68	15.94	35.57	120	39	120	<0.001
16	0	37(100)	6.48 ± 2.51	5.07	7.30	12	9.0	12	<0.001
17	0	37(100)	5.08 ± 2.16	4.43	5.79	9.10	7.30	10	<0.001
18	3(8.10)	34(91.89)	21.40 ± 25.87	14.19	30.37	100.50	34	105	<0.001
19	6(16.22)	31(83.78)	29.40 ± 36.46	18.38	41.75	106.50	100	120	<0.001
20	10(27.0)	27(73.0)	110.73 ± 207.04	51.62	186.92	670.90	464.90	760	>0.05

QNFT Quantitative Fit Test

FF Fit Factor

SD Standard Deviation

CI Confidence Interval

^a Mean FFs of all studied respirators compared to that of the brand 2 (as the best fitting respirator evaluated in this study)