TY - JOUR
T1 - An evidence-based systematic review of amplitude compression in hearing aids for school-age children with hearing loss
AU - McCreery, Ryan W.
AU - Venediktov, Rebecca A.
AU - Coleman, Jaumeiko J.
AU - Leech, Hillary M.
PY - 2012
Y1 - 2012
N2 - Purpose: Two clinical questions were developed: one addressing the comparison of linear amplification with compression limiting to linear amplification with peak clipping, and the second comparing wide dynamic range compression with linear amplification for outcomes of audibility, speech recognition, speech and language, and self- or parent report in children with hearing loss. Method: Twenty-six databases were systematically searched for studies addressing a clinical question and meeting all inclusion criteria. Studies were evaluated for methodological quality, and effect sizes were reported or calculated when possible. Results: The literature search resulted in the inclusion of 8 studies. All 8 studies included comparisons of wide dynamic range compression to linear amplification, and 2 of the 8 studies provided comparisons of compression limiting versus peak clipping. Conclusions: Moderate evidence from the included studies demonstrated that audibility was improved and speech recognition was either maintained or improved with wide dynamic range compression as compared with linear amplification. No significant differences were observed between compression limiting and peak clipping on outcomes (i.e., speech recognition and self-/parent report) reported across the 2 studies. Preference ratings appear to be influenced by participant characteristics and environmental factors. Further research is needed before conclusions can confidently be drawn.
AB - Purpose: Two clinical questions were developed: one addressing the comparison of linear amplification with compression limiting to linear amplification with peak clipping, and the second comparing wide dynamic range compression with linear amplification for outcomes of audibility, speech recognition, speech and language, and self- or parent report in children with hearing loss. Method: Twenty-six databases were systematically searched for studies addressing a clinical question and meeting all inclusion criteria. Studies were evaluated for methodological quality, and effect sizes were reported or calculated when possible. Results: The literature search resulted in the inclusion of 8 studies. All 8 studies included comparisons of wide dynamic range compression to linear amplification, and 2 of the 8 studies provided comparisons of compression limiting versus peak clipping. Conclusions: Moderate evidence from the included studies demonstrated that audibility was improved and speech recognition was either maintained or improved with wide dynamic range compression as compared with linear amplification. No significant differences were observed between compression limiting and peak clipping on outcomes (i.e., speech recognition and self-/parent report) reported across the 2 studies. Preference ratings appear to be influenced by participant characteristics and environmental factors. Further research is needed before conclusions can confidently be drawn.
KW - Amplification
KW - Amplitude compression
KW - Children
KW - Compression limiting
KW - Evidence-based systematic review
KW - Wide dynamic range compression
UR - http://www.scopus.com/inward/record.url?scp=84871482491&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84871482491&partnerID=8YFLogxK
U2 - 10.1044/1059-0889(2012/12-0013)
DO - 10.1044/1059-0889(2012/12-0013)
M3 - Review article
C2 - 22858616
AN - SCOPUS:84871482491
SN - 1059-0889
VL - 21
SP - 269
EP - 294
JO - American journal of audiology
JF - American journal of audiology
IS - 2
ER -