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11 Cards in this Set
- Front
- Back
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Point Prevelance
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Prevalence of a disease at a certain point.
(# with disease)/(# in total population) |
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Incidence Density
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Incidence Density is an average rate, not a proportion
(# new cases)/(# of person's at risk) |
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Case Fatality Rate
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The proportion of individuals contracting a disease who die of that disease
(# of deaths)/(# of those with disease) |
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Relative Risk
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Risk of an event (or of developing a disease) relative to exposure
(Exposed)/(Nonexposed) |
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Prevelence of Disease Calc.
0.04% - prevelence 100,000 - population |
0.0004 * 100,000 = 400
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Sensitivity
Specificity |
Measures the proportion of actual positives which are correctly identified as such
a / (a+c) Measures the proportion of negatives which are correctly identified d / (d+b) |
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Predictive Positive Value
Predictive Negative Value |
Proportion of patients with positive test results who are correctly diagnosed
a / (a+b) Proportion of patients with negative test results who are correctly diagnosed d / (c+d) |
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Basic Reproductive Rate (Ro)
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Ro = 1 + (L / A)
L = avg. life span of individuals A = avg. age at infection |
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Herd Immunity
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H = (Ro - 1) / Ro
= 1 - (1 / Ro) |
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Virulence
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(# of deaths) / (# clinical cases)
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Odds Ratio
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Odds that cases were exposed / odds that controls were exposed
(a*d) / (b*c) or (a/c) / (b/d) |
