Table 1. Quality assessment of human studies on selected criteria.

Criteria	Author(s) (year)
	Bramhall et al (2017) 23	Guest et al (2017) 24	Liberman et al (2016) 16	Mehraei et al (2017) 26	Mehraei et al (2016) 19	Prendergast et al (2017) 28	Stuermer et al (2015) 27	Verhulst et al (2016) 25
Was the paradigm used appropriate for the experimental question(s)?	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Did the study account for other possibilities for CS and/or HHL results?	Yes	Yes	Yes	No	Yes	Yes	Yes	Yes
Were the experimental conditions assessed unconfounded?	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Were the dependent variables clearly defined?	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Were the parameters for measurements described completely?	Yes	Yes	Yes	Yes	Yes	Yes	Yes	Yes
Were measurements made with judges blinded to the experimental conditions?	No	No	No	No	No	No	No	No
Was interjudge reliability assessed?	No	No	No	No	No	No	No	No
Was intrajudge reliability assessed?	No	No	No	No	No	No	No	No
Were “dropouts” accounted for?	Yes	No	No	No	Yes	No	No	No

Abbreviations: CS, cochlear synaptopathy; HHL, hidden hearing loss.