Gaussian
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The statistical distribution of the data is known to be normal in persons without the disease.
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Percentile
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Test result lies within a certain percentile of the possible range of results.
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Diagnositic
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Research has established the probability that the target disease is present, for a given range of test results.
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Therapeutic
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Research has shown that a specific treatment has a known probability of success for a given range of test results.
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Risk factor
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Research has shown that presence of a risk factor increases risk of a specified outcome (e.g. morbidity or mortality).
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Culturally desirable
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Carries strong socio-political expectations of normal appearance or behaviour.
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