Table 1.

Eligibility criteria

Eligibility criteria	Include	Exclude
Publication type	Peer-reviewed, full-length publications of original data.	Non-original data publications; editorials, reviews, letters, opinion pieces, miscellaneous reports, non-empirical studies.
	Publications written in English.	Publications in any language other than English.
	All articles on the topic published between 1985 and May 2019.
Population type	Studies that include participants with dementia of the Alzheimer’s type and/or its prodromal states.	Studies that only address non-cognitively impaired adults or adults without memory complaints.
	Studies with participants that are healthy and participants with cognitive impairment or memory complaints if the data for cognitively impaired participants is reported.	Studies with no age matched comparison (control) group.
	Studies conducted on humans only.	Studies on children or adults with the mean age under 60.
	Studies conducted on humans and other animals if data for humans is reported.
	Studies with an age matched comparison (control) group.
	Studies on elderly adult participants; mean age of 60 years old or older (If mean age not specified the age range for the subject must start at 60 years old).
Assessment type	Studies that use auditory electrophysiological assessments either as a tool for assessing hearing abilities in cognitively impaired adults or as a diagnostic tool for cognitive impairment.	Studies that only use auditory assessments that are not electrophysiological.
	Studies that use a recognised diagnostic criteria, neuropsychological evaluation or medical imaging to diagnose/classify the AD or MCI groups.	Non-human studies.
	Studies that use non-auditory electrophysiological assessments as well as auditory electrophysiological assessments, if the data for the auditory electrophysiological assessments is reported.
Reported outcome	Latency and amplitude measures of the auditory electrophysiological assessments.	Self-reported outcomes.

AD, Alzheimer’s disease; MCI, mild cognitive impairment.