ISO INTERNATIONAL STANDARD 1999 Third edition 2013-10-01 AcousticsEstimationofnoise induced hearing loss Acoustique-Estimation de laperteauditive induiteparlebruit Reference number ISO1999:2013(E) LSO Copyright intenational Organization for Standardizatin IS02013 ted without license from IHS Not for Resale IS0 1999:2013(E) COPYRIGHTPROTECTEDDOCUMENT ISO2013 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address below or ISO's member body in the country of the requester. ISO copyright office Case postale 56.CH-1211 Geneva 20 Tel. + 4122 749 0111 Fax +41 22 749 09 47 E-mail copyright@iso.org Web www.iso.org Published in Switzerland @ IS0 2013 - All rights reserved No reproduction or networking permited without license from IHS Not for Resale ISO 1999:2013(E) Contents Page Foreword ..iv Introduction. ..V 1 Scope. .1 2 Normativereferences ..1 3 Termsand definitions .2 4 Principle ..3 5 Description and measurement ofnoise exposure ..3 6 Prediction oftheeffectsofnoiseonhearingthreshold 6.1 Statistical distribution of hearing threshold levels of a noise-exposed population ..4 6.2 Databases for hearing threshold levels associated with age (HTLA) .4 6.3 Calculation of noise-induced permanent threshold shift, N ..5 7 Assessmentofnoise-inducedhearinglossanddisability .8 7.1 Hearingloss .8 7.2 Hearing disability ..8 7.3 Risk ofhearingdisability .8 Annex A (informative) Calculation of database A, statistical distribution of hearing thresholds as a function of age (HTLA) for an otologically normal population (highly screened) ..10 Annex B (informative) Examples for database B .13 AnnexC (informative)Example ofassessment of risk of noise-induced hearing loss and disability. ..17 AnnexD (informative) Tables with examplesfor NIPTS data .20 Bibliography 22 orStana ili ense from IHS Not for Resale