Table 4:

Correlations between different performance metrics for all source control devices. Each Spearman’s rank coefficient (ρ) was calculated based on data from 22 experiments for all source control devices and 18 experiments for cloth masks (cloth face masks, gaiters, and bandanas). A correlogram of the ρ values in shown in Figure S9 in the SI.

Correlation parameter #1	Correlation parameter #2	All source control devices		Cloth face masks, gaiters, and bandanas only
		ρ	p-value	ρ	p-value
Cough aerosol collection efficiency	Exhaled aerosol collection efficiency	0.76	<0.001	0.67	0.003
	Filtration efficiency of material	0.69	0.001	0.51	0.032
	Airflow resistance of material	0.55	0.009	0.54	0.020
	Human subject fit (N95 mode)	0.57	0.005	0.30	0.208
	Human subject fit (Class 100 mode)	0.68	<0.001	0.48	0.035
	Manikin fit before coughing	0.39	0.076	0.03	0.890
Exhaled aerosol collection efficiency	Filtration efficiency of material	0.60	0.004	0.54	0.023
	Airflow resistance of material	0.51	0.016	0.58	0.012
	Human subject fit (N95 mode)	0.60	0.003	0.51	0.024
	Human subject fit (Class 100 mode)	0.71	<0.001	0.63	0.003
	Manikin fit before breathing	0.72	<0.001	0.68	0.002
Manikin fit before coughing	Manikin fit before breathing	0.61	0.003	0.38	0.112
Filtration efficiency of material	Airflow resistance of material	0.78	<0.001	0.78	<0.001