Term
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Definition
Prevalence of a disease at a certain point.
(# with disease)/(# in total population) |
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Term
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Definition
Incidence Density is an average rate, not a proportion
(# new cases)/(# of person's at risk) |
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Term
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Definition
The proportion of individuals contracting a disease who die of that disease
(# of deaths)/(# of those with disease) |
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Term
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Definition
Risk of an event (or of developing a disease) relative to exposure
(Exposed)/(Nonexposed) |
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Term
Prevelence of Disease Calc.
0.04% - prevelence
100,000 - population |
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Definition
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Term
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Definition
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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Term
Predictive Positive Value
Predictive Negative Value |
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Definition
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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Term
| Basic Reproductive Rate (Ro) |
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Definition
Ro = 1 + (L / A)
L = avg. life span of individuals
A = avg. age at infection |
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Term
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Definition
H = (Ro - 1) / Ro
= 1 - (1 / Ro) |
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Term
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Definition
| (# of deaths) / (# clinical cases) |
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Term
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Definition
Odds that cases were exposed / odds that controls were exposed
(a*d) / (b*c) or (a/c) / (b/d) |
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