Table 3.

Geometric mean overall fit factors (GM FF_o) by respirator family, mask size, and principal component analysis (PCA) panel size.

Respirator Family	Model Size	PCA Panel Size*,†,‡	Number of Donnings	GM FFo	GSD FFo	Min FFo	Max FFo	Duncan’s Grouping§
Three-size family	Large	-	2	11,999	4.1	4,441	32,419	A
		L/N	10	6,217	10.5	14	36,869	A
		Large	10	14,378	2.9	1,628	46,527	A
		Medium	23	8,892	6.0	17	53,298	A
		Small	4	4,645	7.7	616	31,875	A
	Medium	-	2	3,771	1.3	3,093	4,597	A
		L/N	7	3,181	10.8	263	43,255	A
		Large	10	6,600	5.7	209	53,538	A
		Medium	23	4,402	17.1	14	46,293	A
		Small	4	4,306	4.7	663	26,000	A
	Small	-	2	449	1.0	435	463	A
		L/N	8	6,906	4.5	381	26,019	A
		Large	10	3,038	12.1	68	20,379	A
		Medium	23	4,017	9.7	10	49,284	A
		Small	4	6,527	4.9	1,229	25,484	A
Two-size family	Large	-	2	870	181.3	22	34,375	A
		L/N	10	2,182	9.2	9	30,185	A
		Large	10	362	12.2	9	17,817	A
		Medium	23	399	23.7	2	42,380	A
		Small	4	816	66.1	3	22,014	A
	Regular	-	2	5,424	2.9	2,569	11,452	A
		L/N	8	70	8.3	4	1,711	B
		Large	10	78	16.4	2	4,234	B
		Medium	23	152	10.2	3	11,609	B
		Small	3	5,125	2.7	2,559	15,641	A
One-size family	One-size only	-	2	1,473	2.7	727	2,986	A
		L/N	10	1,424	9.4	22	20,950	A
		Large	10	3,134	4.4	191	14,464	A
		Medium	23	1,239	13.3	10	24,246	A
		Small	4	1,297	7.4	170	20,194	A

^*“–” indicates subjects with anthropometric measurements that placed them outside of the limits of the panel.

^†“L/N” means “Long/Narrow” panel size.

^‡None of the subjects were measured to be in the “Short/Wide” panel size.

^§Groups that have statistically different GM FF_o will have different letters.