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Table 1 Categories of HFHL levels

From: A risk model and nomogram for high-frequency hearing loss in noise-exposed workers

HFHL level BHFTA (dB)
Normal hearing ≤25
Suspected HFHL 26–39
HFHL 40–79
Severe HFHL ≥80
  1. Abbreviations: HFHL high-frequency hearing loss, BHFTA binaural high-frequency threshold average
  2. Footnote. According to the General Guidelines for the Diagnosis of Occupational Diseases (GBZ/T 265–2014), HFHL is defined as a BHFTA ≥40 dB