| Type |
Middle ear pressure |
Static compliance |
Ear canal volume |
| A |
+50 to -100 |
0.3 to 1.6 |
0.4 – 1.0 cm3 |
| As |
+50 to -100 |
0.1-0.2 |
0.4 – 1.0 cm3 |
| Ad |
+50 to -100 |
1.7 and above |
0.4 – 1.0 cm3 |
| B |
- |
- |
<0.4 cm3 |
| B |
- |
- |
0.4 – 1.0 cm3 |
| B |
- |
- |
1.0 cm3 < |
| C1 |
-100 to -199 |
0.3 to 1.6 |
0.4 – 1.0 cm3 |
| C2 |
-200 and below |
0.3 to 1.6 |
0.4 – 1.0 cm3 |