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Standardized hearing threshold above 20 Hz (ISO 226:2003) and results from recent investigations covering frequencies at and below 20 Hz. (Whittle et al. (1972): weighted average of 30- and 43-year groups; Yeowart and Evans (1974): weighted average of ear and full-body exposures; Yamada et al. (1980): weighted average of men and women).

Standardized hearing threshold above 20 Hz (ISO 226:2003)
and results from recent investigations covering frequencies at and below 20 Hz. (Whittle et al. (1972): weighted average of 30- and 43-year groups; Yeowart and Evans (1974): weighted
average of ear and full-body exposures; Yamada et al. (1980):
weighted average of men and women).