ForewordIntroductionScopeNormative referencesTerms and definitionsMeasurement of sound attenuation of hearing protectorsCalculation of the assumed protection value, , of a hearing protector for a selected protection performanceOctave-band method methodGeneralCalculation of and valuesApplication of method for estimation of the effective A-weighted sound pressure level methodGeneralCalculation of valuesApplication of method for estimation of the effective A-weighted sound pressure levelExample of the calculation of the assumed protection values, Example of the calculation of according to the octave-band methodExample of the calculation and use of , and valuesCalculation of , and values for a particular hearing protectorUse of , and values to estimate for a particular hearing protector in a specific noise situationExample of the calculation and use of valuesCalculation of the value for a particular hearing protectorUse of the value to estimate for a particular hearing protector in a specific noise situation for which is knownUse of the value to estimate for a particular hearing protector in a specific noise situation in which the A-weighted sound pressure level has been measured and a reasonable estimate of is availableUncertainty of attenuation values and ratingsGeneralExample of uncertainty