Collapse of the ear canal during routine audiometry.
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Tinnitus is discussed, with particular reference to the problem of assessing severity. The authors argue that tinnitus severity can only usefully be determined by measuring the impact of tinnitus on an individual, and therefore propose a scale to estimate severity in these terms. Data presented on 112 members of a tinnitus self-help group, demonstrated the reliability of a Subjective Tinnitus Severity Scale (S.T.S.S.), with a coefficient alpha of 0.84. This indicates a high degree of internal consistency, i.e.: statistically this scale is measuring aspects of a single dimension. The validity was established in a separate sample of 30 clinic attenders, where mean S.T.S.S. scores were found to correlate highly with two independent clinical ratings of severity (r2 = 0.76, p less than 0.001, and r2 = 0.73, p less than 0.001). Additionally, in these patients S.T.S.S. scores were significantly associated with several audiometric variables, although the correlations were of low magnitude.
Accurate bone-conduction testing with masking is always difficult, but for clinical purposes limited accuracy suffices. However, when assessing claimants for compensation, extreme care is needed since even small apparent air-bone gaps are sometimes translated into financial abatement. This paper sets out the stringent test conditions required to achieve adequate precision. It also indicates the inaccuracies inherent in such tests, and recommends procedures for interpreting the significance of bone-conduction thresholds.
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