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Median absorbance is plotted (black lines) across frequency for each of the subgroups of ears with the same TM stiffness classification (1 through 5) obtained via pneumatic otoscopy. Stiffness classifications are defined as follows: (1) Normal (N+), (2) Slightly stiff (SS), (3) Moderately stiff (MS), (4) Very stiff (VS), and (5) No movement (i.e., immobile; IM). The absorbance for the middle-ear effusion (MEE) group is plotted for comparison (gray dotted line).
