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Comparison of the user-defined pneumatic metrics based on different middle ear conditions. A, The overall tympanic membrane (TM) thickness was generally greater when a middle ear effusion (MEE) or scarring was present. B, The statistically greater pneumatic stiffness was observed when TM scarring was present. C, The phase lag of the MEE group was significantly longer than the other two groups. Detailed information for each subject ear can be found in Table 1
