Table 3.

Aspiration efficiency (fraction) and coefficient of variation (fraction) by particle size and velocity conditions (breathing rate category and freestream velocity)

Number of conditions	4	2	4	4	2	4	20
Particle size (μm)	At-rest, 0.2 m s−1	Moderate, 0.2 m s−1	Heavy, 0.2 m s−1	At-rest, 0.4 m s−1	Moderate, 0.4 m s−1	Heavy, 0.4 m s−1	All
Mean aspiration fraction
22	0.919	0.929	0.933	0.900	0.911	0.927	0.920
68	0.606	0.774	0.838	0.542	0.699	0.757	0.696
82	0.300	0.549	0.707	0.361	0.482	0.629	0.502
100	0.073	—	0.483	0.176	—	0.438	0.293
116	0.000	0.066	0.244	0.016	0.102	0.279	0.125
Coefficient of variation
22	0.023	0.005	0.006	0.021	0.012	0.002	0.018
68	0.149	0.048	0.018	0.329	0.027	0.015	0.197
82	0.438	0.137	0.059	0.323	0.141	0.034	0.351
100	0.059	—	0.036	0.570	—	0.051	0.645
116	2.000	1.414	0.181	0.965	1.346	0.143	1.022