By M. E. Lutman and M. P. Haggard (Auth.)
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Additional resources for Hearing Science and Hearing Disorders
Example text
Not only is it necessary to document the extent of these impairments (Shepherd,1978), but it is essential that we extend our understanding of hearing disorders in order that appropriate preventative and remedial services may be organised. In this chapter I hope to achieve four limited objectives. Firstly, I wish to emphasise a rationale for conducting population studies of hearing, which goes beyond the primary aim of accumulation of gross prevalence figures. This entails developing a better understanding of hearing disorders using several aspects of the impairment, disability and handicap that are a consequence of disease; the discussion of these aspects provides my second objective.
Davis Contents I. INTRODUCTION AND AIMS A. II. III. IV. Rationale for the population study i. Extent of hearing disorders ii. Schema for hearing dysfunction iv. The importance of disability THE DESIGN OF THE NATIONAL STUDY OF HEARING PREVALENCE OF REPORTED AUDITORY IMPAIRMENT AND DISABILITY A. Self-reported hearing problems B. Prevalence of tinnitus C. Reported noise exposure RELATIONSHIP BETWEEN MEASURED AUDIOLOG ICAL IMPAIRMENT AND SELF-REPORTED IMPAIRMENT V. PREVALENCE OF TYPES AND DEGREES OF AUDITORY IMPAIRMENT VI.
To do this, account must be taken of other explanatory variables which might actually mediate any apparent effect. For example, sex differences in hearing impairment could conceivably be explained largely in terms of differences in noise exposure, so the effect of noise exposure must be held constant when making this kind Table 5. Sex The Percentages of People With Three Degress of Hearing Impairment as a Function of Sex Percent with hearing level Average hearing level dB HL greater than or equal to Better ear Worse ear 25 dB 35 dB 45 dB Male 20 9 5 15 21 Female 14 8 5 13 19 A.