Table 3.

The mask resistance (R), the mask resistance extrapolated at zero flow (K1) and flow dependent component of resistance (K2) during inspiration and expiration, expressed as mean calculated from set 1–4.

Mask #	R		K1		K2
	Inspiration	Expiration	Inspiration	Expiration	Inspiration	Expiration
1	0.419	0.422	0.345	0.396	0.104	−0.026
2	0.370	0.375	0.289	0.351	0.109	−0.025
3	0.401	0.405	0.322	0.381	0.105	−0.024
4	0.363	0.369	0.287	0.355	0.094	−0.014
5	0.392	0.395	0.329	0.372	0.088	−0.023
6	0.369	0.373	0.303	0.355	0.090	−0.019
7	0.394	0.397	0.326	0.374	0.084	−0.023
8	0.279	0.282	0.221	0.264	0.082	0.018
9	0.306	0.312	0.242	0.312	0.085	−0.0003
10	0.312	0.316	0.251	0.308	0.083	−0.008
Mean	0.360	0.365*	0.291	0.347*	0.092	−0.018*
SD	0.046	0.046	0.042	0.040	0.010	0.008

All intermediate calculations were carried out to full precision and rounded to three decimal places at the reporting stage.

^*R, K1, and K2 inspiration vs. expiration p < 0.0001.