Audiometric data
Six-frequency
PTA was performed before the start of treatment (D1) and on days 7
(early test point, D7), 13 (middle test point, D13), 24 (late test
point, D24), and 90 (long-term test point, D90) or until the patient
fully recovered. The mean PTA values at low-mid frequencies (0.25, 0.5,
and 1 kHz) and high frequencies (2, 4, and 8 kHz) were calculated. The
total effective rate was the sum of complete, marked and slight hearing
gain (PTA >15 dBHL) according to Siegel’s
criteria[3].