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Table 1:

Number of ears with audiometric results per anatomic malformation

MalformationPTATympanometrya
No HL (%)HLType
C (%)SN (%)M (%)PTA Range in dBABCAsAdLV
Dense malleus2 (100)
Dense stapes superstructure7 (39)6 (33)1 (6)4 (22)21–10033132
IP type II5 (42)3 (25)1 (8)b3 (25)38–100
LSCC: small bony island7 (41)4 (24)3 (18)b3 (18)b35–100
LSCC: single cavity6 (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.