TABLE I.

Generalized linear mixed effect model (binomial family) for response variables SI and LE (from extremely difficult to extremely easy) considering as predictors (1) mask and (2) room. Listener and type of headphones were used as random factors. Significance codes for the p-values: *** < 0.001, ** < 0.01, * < 0.05.

SI (–)	Estimate	Standard error	z value	p-value
(Intercept)	−0.24	0.17	−1.41	0.159
Mask M1	−0.84	0.05	−16.16	<0.001	***
Mask M2	−0.61	0.05	−11.99	<0.001	***
Mask M3	−0.64	0.05	−12.61	<0.001	***
Room 2	−0.70	0.04	−18.56	<0.001	***

LE (–)	Estimate	Standard error	z value	p-value
(Intercept)	0.44	0.15	3.07	0.002	**
Mask M1	−0.95	0.06	−16.94	<0.001	***
Mask M2	−0.89	0.06	−16.06	<0.001	***
Mask M3	−1.00	0.06	−17.82	<0.001	***
Room 2	−1.37	0.04	−32.78	<0.001	***