There are 2 studies that match your criteria.
Criteria: Study Type=Human / Provocation,Freq Range=300 kHz - 300 GHz (RF/mmW/THz),Study Subtype=Hearing Aid Compatibility (HAC)

View This Study - Citation No: 3259
Title	ACCEPTABLE NOISE LEVEL AS A PREDICTOR OF HEARING AID USE
Reference	J Am Acad Audiol, Vol. 17, Pg. 626 - 639, 2006
Author(s)	Nabelek A. K., Freyaldenhoven M. C., Tampas J. W., Burchfiel S. B., Muenchen R. A.
PubMed UID	17039765
Project ID	1772
View This Study - Citation No: 3260
Title	COMPARISON OF SPEECH PERCEPTION IN BACKGROUND NOISE WITH ACCEPTANCE OF BACKGROUND NOISE IN AIDED AND UNAIDED CONDITIONS
Reference	J Speech Lang Hear Res, Vol. 47, Pg. 1001 - 1011, 2004
Author(s)	Nabelek A. K., Tampas J. W., Burchfield S. B.
PubMed UID	15603458
Project ID	1772