1naresh
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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.