Table 2 Numerical values of METF tolerance interval ranges.
From: Methods and reference data for middle ear transfer functions
Frequency in Hz | METF in dB ref. 1 µm/Pa | METF 2-sided tolerance intervals (α = 0.95) in dB ref. 1 µm/Pa | |||
|---|---|---|---|---|---|
Mean | 95% confidence interval of mean | 95% population proportion | |||
Lower boundary | Upper boundary | Lower boundary | Upper boundary | ||
SFD—stapes footplate displacement | |||||
125 | − 31.6 | − 32.2 | − 30.9 | − 43.2 | − 19.9 |
250 | − 34.2 | − 34.8 | − 33.6 | − 46.1 | − 22.3 |
500 | − 33.2 | − 33.8 | − 32.5 | − 45.8 | − 20.5 |
1000 | − 34.4 | − 34.9 | − 33.8 | − 44.7 | − 24.0 |
2000 | − 45.7 | − 46.3 | − 45.0 | − 58.0 | − 33.3 |
3000 | − 53.2 | − 54.0 | − 52.5 | − 68.1 | − 38.4 |
4000 | − 57.8 | − 58.7 | − 56.9 | − 76.0 | − 39.6 |
6000 | − 67.0 | − 68.0 | − 66.1 | − 85.5 | − 48.7 |
Frequency in Hz | METF in dB ref. 1 µm/s/Pa | METF 2-sided tolerance intervals (α = 0.95) in dB ref. 1 µm/s/Pa | |||
|---|---|---|---|---|---|
Mean | 95% confidence interval of mean | 95% population proportion | |||
Lower boundary | Upper boundary | Lower boundary | Upper boundary | ||
SFV—stapes footplate velocity | |||||
125 | 26.3 | 25.6 | 27.0 | 14.7 | 38.0 |
250 | 29.7 | 29.1 | 30.3 | 17.8 | 41.6 |
500 | 36.8 | 36.1 | 37.4 | 24.1 | 49.4 |
1000 | 41.6 | 41.1 | 42.1 | 31.3 | 52.0 |
2000 | 36.3 | 35.7 | 36.9 | 24.0 | 48.7 |
3000 | 32.3 | 31.5 | 33.0 | 17.4 | 47.1 |
4000 | 30.2 | 29.3 | 31.1 | 12.0 | 48.4 |
6000 | 24.4 | 23.5 | 25.4 | 6.0 | 42.9 |
