“…The questionnaire consisted of different components. Besides some general questions parts of existing questionnaires were included like the Hearing Handicap and Disability Inventory (HHDI, van den Brink, 1995), the Amsterdam Inventory of Auditory Disability and Handicap (AIADH, Kramer et al, 1995), Abreviated Profile of Hearing Aid Benefit (APHAB, Cox et al, 1995), and the International Outcome Inventory for Hearing Aids (IOI-HA, Cox et al, 2000). In addition we asked about the reasons why the patients used one or two hearing aids.…”