Acceptable noise level (ANL) and real-world hearing-aid success in Taiwanese listeners.Int J Audiol. 2013 Nov; 52(11):762-70.IJ
The objective of this prospective study was to investigate the relationship between acceptable noise level (ANL), which was measured using Taiwanese and the international speech test signal (ISTS), and real-world hearing-aid success for listeners who were representative of the population commonly seen in clinics.
Unaided ANLs were measured pre-hearing-aid fitting. Hearing-aid success was assessed three months post-fitting using the international outcome inventory for hearing aids (IOI-HA) and a hearing-aid use questionnaire.
Eighty adults with hearing impairment completed the study.
Both Taiwanese and ISTS ANLs were significantly associated with hearing-aid success, with higher ANLs suggesting poorer outcomes. However, the ANL's prediction accuracy for the probability of hearing-aid success was either much lower than that suggested by some literature, or was not much different from that of simply predicting all listeners as successful users.
The current study suggested the possibility of using ANL to predict hearing-aid success. However, the usefulness of ANL as a clinical tool is unlikely to be as great as indicated by the literature.