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16 Cards in this Set
- Front
- Back
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Level A suit
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Encapsulating
Supplied respirator |
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Level B suit
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Non-encapsulating
Supplied respirator |
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Level C
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Non-encapsulating
Air-purifier |
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Level D
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Standard work clothes
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Cross-sectional study compares exposed group to unexposed group
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at one snapshot in time
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Ecologic studies
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Assess population numbers, not individuals (for example comparing admission rates in two cities)
Use relative risk |
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Hill's viewpoints
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Strength of association
Consistency Specificity Biological gradient Temporal precedence Coherence Plausibility Experimental support Analogy |
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HEPA filter removes
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97% of .3 micron particls
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Absolute risk can only be calculated in
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randomized controlled trials or cohort studies
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Attributable risk =
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risk difference
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Relative risk =
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risk exposed/risk unexposed
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attributable risk %=
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(risk exposed- risk unexposed)/
risk exposed |
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Population attributable risk
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(total risk-unexposed risk)/
total risk |
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First step in risk assessment
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Hazard identification
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What are the different uncertainty factors?
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Animal data to human
Human variation in susceptibility LOEAL instead of NOAEL Extrapolation from acute to chronic |
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Linear no threshhold effect model is used for
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Cancer risk
Assumes no threshold for toxicity |
