Is it necessary to measure hearing protector attenuation at 3.15 and 6.3 kHz?

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Bibliographic Details
Title: Is it necessary to measure hearing protector attenuation at 3.15 and 6.3 kHz?
Authors: Berger, E. H., Rowland, L. D.
Source: Journal of the Acoustical Society of America; April 1989, Vol. 85, p1590-1594, 5p
Database: Applied Science & Technology Source
Description
ISSN:00014966
DOI:10.1121/1.397362