“…There are too many factors influencing hearing/listening as well as hearing aid performance, such as, for example, audiometric factors (e.g., type, degree and configuration of hearing loss), personal factors (e.g., motivation, expectation, stigma and previous experience with devices), demographic factors (e.g., age, sex, job and listening environment) and external factors (e.g., cost and counseling) [ 4 , 5 , 36 ]. A lot of previous studies included personal and demographic factors, but few studies evaluated specific audiometric data.…”