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| Past efforts to collect data on national |
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| level |
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| n | Lowest level of
statistical representation = US |
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| geographic
regions |
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| – | Data collected on
representative sample of US population |
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| n | Demand high
level of human and material resources |
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| – | In case of dental
caries, use of visual-tactile assessments |
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| – | of all teeth/surfaces |
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| – | by trained,
standardized dentists |
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| 7 |