TABLE 1.
Characteristics of five audiometric phenotypes of age-related hearing loss
| Phenotype | Low frequency (0.25–1.0 kHz) | High frequency (2.0–8.0 kHz) | Age | Gender | Noise History | ||
|---|---|---|---|---|---|---|---|
| Range (dB HL) | Slope (dB/oct) | Range (dB HL) | Slope (dB/oct) | ||||
| Older-normal | ≤10 | −5 to 5 | 0 to 20 | −5 to 5 | Younger | Female>Male | No>Yes |
| Pre-metabolic | ≤10 | −5 to 5 | ≤25 | 0 to 10 | Younger | Female>Male | No>Yes |
| Metabolic | 10 to 40 | −5 to 5 | 30 to 60 | 10 to 20 | Older | Female>Male | No>Yes |
| Sensory | ≤10 | >5 | >40 | ≥20 | Younger | Male>Female | Yes>No |
| Metabolic + Sensory | 10 to 40 | −5 to 5 | >40 | ≥20 | Older | Male>Female | Yes>No |