- The new laboratory incorporated multiple methods for measuring hearing threshold to permit comparisons of their efficacy. The HLR program studied the performance of proposed fit-testing systems and demonstrated the equivalence of attenuation estimates between ANSI S12.6-1997 Method B and a computer-based fit-test system. The HLR program developed methods to estimate protected exposure levels from limited data and to predict the quality of a user's fit based upon statistical classification techniques.
- Murphy WJ, Franks JR, Berger EH, Behar A, Casali JG, Dixon-Ernst C, Krieg EF, Mozo BT, Royster JD, Royster LH, Simon SD, Stephenson C . Development of a new standard laboratory protocol for estimation of the field attenuation of hearing protection devices: sample size necessary to provide acceptable reproducibility. J Acoust Soc Am 115(1): 311-323.
- Franks JR, Murphy WJ, Harris D, Johnson JL, Shaw PB . Alternative field methods for measuring hearing protector performance. Am Ind Hyg Assoc J 64(4):501-509.
- Berger EH, Franks JR, Behar A, Casali JG, Dixon-Ernst C, Kieper RW, Merry CJ, Mozo BT, Nixon CW, Ohlin D, Royster JD, Royster LH . Development of a new standard and laboratory protocol for estimating the field attenuation of hearing protection devices, Part III: the validity of using subject-fit data. J Acoust Soc Am 103: 665-672.