| |
| |
| |
| Introduction | |
| |
| |
| Historical Background and Terms of Reference | |
| |
| |
| Rationale and Philosophy, Scope and Report | |
| |
| |
| |
| Definitions Particular to this Report | |
| |
| |
| |
| Technical Background | |
| |
| |
| General, Surrogate Measures of disability | |
| |
| |
| Characterization of The Concept of Hearing Disability | |
| |
| |
| Scale relation Between Autiometric Impairment and Disability | |
| |
| |
| The low Fence and The high Fence | |
| |
| |
| Differential Weighting of The two Ears | |
| |
| |
| Age-associated Hearing loss | |
| |
| |
| |
| Audiometric Equipment | |
| |
| |
| Equipment for Air-conduction Audiometry | |
| |
| |
| Equipment for Bone-conduction Audiometry | |
| |
| |
| Additional Equipment | |
| |
| |
| Equipment required for Calibration of Audiometers | |
| |
| |
| Quality Assurance | |
| |
| |
| Quality Assurance � general | |
| |
| |
| Principles of Calibration | |
| |
| |
| Procedures | |
| |
| |
| Background Noise Requirements for The Test Room | |
| |
| |
| Specific Recommendations Applicable to Audiometry for disability Assessment | |
| |
| |
| |
| Determining Hearing Threshold Levels in Usual cases | |
| |
| |
| Audiometric Procedure - Procedure for air Conduction Testing | |
| |
| |
| Procedure for Bone Conduction Testing | |
| |
| |
| Reporting of Results | |
| |
| |
| Sources of Error in audiometry - Sources of Objective Error | |
| |
| |
| Systematic and Random Uncertainties associated With Audiometric Techniques | |
| |
| |
| Uncertainties Associated With The subject | |
| |
| |
| Normal Expectation of Audiometric Reliability | |
| |
| |
| Abnormal Performance or unusual Occurrences | |
| |
| |
| Uncertainties Associated With Audiometric Techniques | |
| |
| |
| Uncertainties Associated With The Subject | |
| |
| |
| Normal Expectation of Audiometric reliability | |
| |
| |
| Abnormal Performance or Unusual Occurrences | |
| |
| |
| Uncertainties associated With The Audiometrician and The Interpretation or Responses | |
| |
| |
| Qualifications and Training of Personnel | |
| |
| |
| |
| Determination of Hearing threshold Levels in Abnormal Cases | |
| |
| |
| Detection of Spurious Hearing Threshold level (shtl) | |
| |
| |
| Estimation of Genuine Hearing Threshold Levels (ghtl) | |
| |
| |
| |
| Evaluation of Compensable Hearing Loss | |
| |
| |
| Mandatory Requirements | |
| |
| |
| Conditional and discretionary Tests | |
| |
| |
| Principles of Evaluation | |
| |
| |
| Age-associated Hearing Loss (aahl) | |
| |
| |
| Evaluation of a Conductive Component of Hearing Loss | |
| |
| |
| Relevant conductive Hearing Loss | |
| |
| |
| Evaluation of The Decibel Value of The Chl | |
| |
| |
| |
| Tables for Calculating Percentage Disability | |
| |
| |
| Source Material and Derivation | |
| |
| |
| Basic Relation Between Hearing Threshold Level and Percentage Disability | |
| |
| |
| Binaural Evaluation | |
| |
| |
| Tables of Percentage Disability | |
| |
| |
| |
| Assessment of disability | |
| |
| |
| General Plan | |
| |
| |
| Diagnosis of Noise-induced Hearing Loss | |
| |
| |
| Assessment of Overall and Noise-induced Hearing Disability | |
| |
| |
| Apportionment | |
| |
| |
| How to use The tables | |
| |
| |
| General Procedure | |
| |
| |
| Procedure When There is a Constitutional Element | |
| |
| |
| |
| Additional Assessment Procedures | |
| |
| |
| Retrospective Assessment and Rules for Apportionment | |
| |
| |
| Prognostic Assessment | |
| |
| |
| Other Considerations | |
| |
| |
| Tinnitus | |
| |
| |
| Noise-induced Vestibular Malfunction | |
| |
| |
| Use of Hearing Aids | |
| |
| |
| |
| Contents of the Medicolegal Report | |
| |
| |
| |
| Summary of Recommendations | |