Table 3. Normative tympanometric width data at 226 Hz from three studies. Tympanometric width is the pressure interval corresponding to a 50% reduction in peak compensated admittance.
| Study | Population | Pressure rate |
Ear-canal correction |
M | 90% range |
|---|---|---|---|---|---|
| deJonge (1986) |
Adults | 50 daPa/s | −300 daPa | 110 | 60–160 |
| Koebsell & Margolis (1986) |
Children (3–5 yrs) |
50 & 200 daPa/s |
Minimum | 133 | 80–200 |
| Margolis & Heller (1987) |
Children (3–5 yrs) |
200 & 400 daPa/s |
+200 daPa | 100 | 59–151 |
| Adults | 200 & 400 daPa/s |
+200 daPa | 77 | 51–114 |