Type | Middle-ear pressure, daPa | Tympanogram | Interpretation |
---|---|---|---|
A | 200 to −99 | Peak in this range | Normal |
C1 | −100 to −199 | Peak in this range | Normal |
C2 | −200 to −399 | Peak in this range | Positive predictive value of 54% for otitis media with effusion |
B | ≥ −400 | Flat trace without a discernible peak | Positive predictive value of 88% for otitis media with effusion |