Number of ears with audiometric results per anatomic malformation
| Malformation | PTA | Tympanometrya | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| No HL (%) | HL | Type | |||||||||
| C (%) | SN (%) | M (%) | PTA Range in dB | A | B | C | As | Ad | LV | ||
| Dense malleus | 2 (100) | – | – | – | – | – | – | – | – | – | – |
| Dense stapes superstructure | 7 (39) | 6 (33) | 1 (6) | 4 (22) | 21–100 | 3 | 3 | 1 | 3 | – | 2 |
| IP type II | 5 (42) | 3 (25) | 1 (8)b | 3 (25) | 38–100 | ||||||
| LSCC: small bony island | 7 (41) | 4 (24) | 3 (18)b | 3 (18)b | 35–100 | ||||||
| LSCC: single cavity | 6 (40) | 5 (33) | 2 (13) | 2 (13) | 25–96 | ||||||
Note:—HL indicates hearing loss; C, conductive; SN, sensorineural; M, mixed; PTA, pure tone average; A, normal situation; B, flat curve; C, negative peak pressure; As, small pressure peak; Ad, high pressure peak; LV, large volume; IP, incomplete partition.
↵a The number of ears does not amount to the total number of ears with a malformation due to missing data.
↵b Including 1 ear measured with visual reinforcement audiometry and brain stem evoked response audiometry.