How we do it: tympanoplasty: are different three- and four-frequency averages comparable?

Area of Science:

• Otolaryngology
• Audiology
• Medical Statistics

Background:

• Tympanoplasty outcomes are reported inconsistently.
• Pure-tone audiometry is standard, but frequency averaging methods vary.
• Lack of standardization hinders result comparison.

Purpose of the Study:

• To analyze the impact of different pure-tone audiometry frequency averages on tympanoplasty outcome reporting.
• To compare hearing thresholds using 0.5, 1, 2 kHz; 0.5, 1, 2, 3 kHz; and 0.5, 1, 2, 4 kHz averages.
• To determine the influence of the 4-kHz threshold on reported air-bone gap closure.

Main Methods:

• Retrospective analysis of audiometric data from 77 tympanoplasty patients.
• Calculation and comparison of hearing thresholds using three distinct pure-tone frequency averages.
• Statistical analysis to identify significant differences between the averages.

Main Results:

• The three- and four-frequency averages (0.5, 1, 2 kHz; 0.5, 1, 2, 3 kHz; 0.5, 1, 2, 4 kHz) showed significant differences.
• The 4-kHz threshold was the primary determinant of these differences.
• Including 4 kHz in the average reduced the reported success rate for air-bone gap closure to within 10 dB or 20 dB by 8%.

Conclusions:

• The choice of pure-tone audiometry frequency average significantly affects tympanoplasty outcome reporting.
• The 4-kHz frequency plays a critical role in outcome assessment.
• Standardized audiometric reporting measures are essential for comparing surgical results across studies.