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Table 2 Comparison of healthy ET and PET COT following testing of 226 Hz and 678 Hz probe tones

From: The 678 Hz acoustic immittance probe tone: a more definitive indicator of PET than the traditional 226 Hz method

  226 Hz 678 Hz
  Average COT (mL) SD (mL) Average COT (mL) SD (mL)
Healthy ET 0.07 0.05 0.12 0.12
PET 0.26 0.08 0.69 0.35