Table 1.

Summary of unsuccessful fit-tests by stage of failure.

Point of failure	HME filter Uncoated adaptor	P3 filter Uncoated adaptor	P3 filter Coated adaptor	Total
Stage 1: Normal breathing	16	7	8	31
Stage 2: Deep breathing	0	1	0	1
Stage 3: Head side-to-side	0	2	1	3
Stage 4: Head up-and-down	0	2	4	6
Stage 5: Talking	0	1	1	2
Stage 6: Bending forward	0	2	2	4
Stage 7: Normal breathing	0	0	0	0