Chart 1. Search strategy in the 3 databases, Vitória, Espírito Santo, Brazil, 2022.

MEDLINE/PubMed	POPULATION #1 ((“Young Adult” [MeSH Terms] OR “Adult” [MeSH Terms])) EXPOSURE #2 ((“Masks” [MeSH Terms] OR “Mask” [All Fields] OR “N95 Respirators” [MeSH Terms] OR “N95 Respirator” [All Fields] OR “Respirator, N95” [All Fields] OR “N95 Face Masks” [All Fields] OR “Face Mask, N95” [All Fields] OR “N95 Face Mask” [All Fields] OR “N95 Masks” [All Fields] OR “Mask, N95” [All Fields] OR “N95 Mask” [All Fields] OR “N95 Filtering Facepiece Respirators” [All Fields] OR “N95 FFRs” [All Fields] OR “N95 FFR” [All Fields])) OUTCOMES #3 ((“Voice Quality” [MeSH Terms] OR “Voice Qualities” [All Fields] OR “Auditory Perception” [MeSH Terms] OR “Perception, Auditory” [All Fields] OR “Auditory Processing” [All Fields] OR “Processing, Auditory” [All Fields] OR “Speech Acoustics” [MeSH Terms] OR “Acoustics, Speech” [All Fields] OR “Acoustic, Speech” [All Fields] OR “Speech Acoustic” [All Fields])) #4 #1 AND #2 AND #3
Cochrane Library	POPULATION #1 (Young Adult) OR (Adult) EXPOSURE #2 (Masks) OR (Mask) OR (N95 Respirators) OR (N95 Respirator) OR (Respirator, N95) OR (N95 Face Masks) OR (Face Mask, N95) OR (N95 Face Mask) OR (N95 Masks) OR (Mask, N95) OR (N95 Mask) OR (N95 Filtering Facepiece Respirators) OR (N95 FFRs) OR (N95 FFR) OUTCOMES #3 (Voice Quality) OR (Voice Qualities) OR (Auditory Perception) OR (Perception, Auditory) OR (Auditory Processing) OR (Processing, Auditory) OR (Speech Acoustics) OR (Acoustics, Speech) OR (Acoustic, Speech) OR (Speech Acoustic)
Embase	POPULATION #1 (‘adult’ OR ‘young adult’) EXPOSURE #2 (‘Masks’ OR ‘Mask’ OR ‘Minimally 94 percent efficient filtering facepiece respirator’ OR ‘N-95 Respirator’ OR ‘N95 control respirator’ OR ‘N95 face-mask’ OR ‘N95 facemask’ OR ‘N95 facial mask’ OR ‘N95 FFR’ OR ‘N95 FFRs’ OR ‘N95 filtering face piece’ OR ‘ N95 filtering facepiece’ OR ‘95 filtering facepiece particulate respirator’ OR ‘N95 filtering facepiece respirator’ OR ‘N95 half-mask respirator’ OR ‘N95 mask’ OR ‘N95 particulate filter respirator’ OR ‘N95 particulate filtering facepiece respirator’ OR ‘N95 respirator’ OR ‘N95 respirators’ OR ‘N95 surgical mask respirator’ OR ‘surgical mask’) OUTCOMES #3 (‘Voice’ OR ‘voice quality’ OR ‘vox’ OR ‘auditory processing disorder’ OR ‘auditory comprehension disorder’ OR ‘auditory perception disorder’ OR ‘auditory perceptual disorder’ OR ‘central auditory processing disorder’ OR ‘psychoacoustical disorder’ OR ‘speech’ OR ‘speech acoustics’ OR ‘speech production’)