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Epi - Lec 15
Epi
9
Biology
Undergraduate 3
10/25/2012

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Cards

Term

Prevalence vrs. Incidence:

- what does numerator measure?

- key terms in questions

- how many tests required

- point of test

Definition
[image]
Term
equation for risk
Definition
# of new cases in specified time period/ initial # at risk - 1/2 Wd's during time
Term
2 facts about withdrawals with relation to disease being studied
Definition
those that left study didn't develop disease, but they were at risk for it when the study started.
Term
what is contained in the numerator and denominator for rate/incidence density (including withdrawals)
Definition
numerator: count of new cases in study time period
denominator: sum of units of time that each individual was at risk and observed
for withdrawals: it is the sum of time that the individ was at risk before leaving the study.
Term
is risk or rate the true rate, ie measuring the average speed that newly diagnosed cases of diseases are developed
Definition
rate
Term
Give equations for Exact denominator and approximate denominator for rate
Definition

exact: 

[image]

approximate: 

[image]

Term
Is prevalence or incidence higher for chronic and short term illnesses?
Definition
chronic disease: Prevalence > Incidence
Short term Illness: Prevalence < Incidence
Term

Give equations for: 

crude morbidity rate

crude mortality rate

cause-specific mortality rate

case fatality "rate"

attack "rate"

*note the "rate"s aren't actually rates. just termed that way. 

Definition
[image]
Term
relationship between prevalence, duration and incidence. (formula)
Definition
prevalence = incidence X duration
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