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Articles

The effect of tightened hearing protection regulations on military noise-induced tinnitus

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Pages 394-400 | Received 24 Aug 2008, Published online: 21 Jul 2009
 

Abstract

The objective of this study was to investigate the effect of tightened hearing protection regulations on tinnitus in the Finnish Defence Forces. The initial study group comprised 252 officers and non-commissioned officers (NCOs), of which 229 were included in the final study group. Subjective symptoms of tinnitus and audiometric test results for these officers and NCOs examined before retirement, from 1984 to 1986 (Period I), and 2003 to 2005 (Period II), were reviewed. Changes in tinnitus reports between the two time periods, during which regulations had been revised, were investigated. Prevalence of tinnitus showed a decline both in officers (from 68% to 63%) and in NCOs (from 76% to 72%) between the two study periods, in accordance with tightened hearing protection regulations. The Cox regression analysis showed a significantly decreased hazard ratio for constant or disturbing tinnitus for Period II. Tinnitus prevalence, especially constant or disturbing tinnitus, in the Finnish Defence Forces was diminished by tightened hearing protection regulations. Tinnitus might be more persistent than hearing loss and does not necessarily improve in direct relation to hearing loss after protective measures.

Abbreviations
AAT=

Acute acoustic trauma

CI=

Confidence interval

CMH=

Central Military Hospital

dB=

Decibel

ENT=

Ear, nose and throat

FDF=

Finnish Defence Forces

HR=

Hazard ratio

NCO=

Non-commissioned officer

VAS=

Visual analogue scale

Abbreviations
AAT=

Acute acoustic trauma

CI=

Confidence interval

CMH=

Central Military Hospital

dB=

Decibel

ENT=

Ear, nose and throat

FDF=

Finnish Defence Forces

HR=

Hazard ratio

NCO=

Non-commissioned officer

VAS=

Visual analogue scale

Abstract

El objetivo de este estudio fue investigar el efecto sobre el acúfeno de regulaciones de protección auditiva más estrictas en las Fuerzas Finlandesas de Defensa. El grupo de estudio inicial tuvo 252 oficiales y oficiales no comisionados (NCOs), de los cuales 229 se incluyeron en el grupo de estudio final. Se revisaron los síntomas subjetivos de acúfeno y los resultados de las pruebas audiométricas en estos oficiales y en los NCOs examinados antes de jubilarse, de 1984 a 1986 (Período I) y de 2003 a 2005 (Período II). Se investigaron los cambios en los reportes de acúfeno entre los dos períodos, durante los cuales fueron revisadas las regulaciones. La prevalencia del acúfeno mostró una declinación tanto en oficiales (de 68% a 63%) como en NCOs (de 76% a 72%), entre los dos períodos, de acuerdo con el mayor rigor de las regulaciones de protección auditiva. El análisis de regresión de Cox mostró una relación de riesgos significativamente disminuída frente a acúfeno constante o molesto en el Período II. La prevalencia del acúfeno especialmente constante o molesto en las Fuerzas Finlandesas de Defensa, disminuyó por el mayor rigor de las regulaciones de protección auditiva. El acúfeno puede ser más persistente que la pérdida auditiva y no necesariamente mejora en relación directa con la propia pérdida auditiva después de instaurar medidas de protección.

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