Term
Prevalence vrs. Incidence:
- what does numerator measure?
- key terms in questions
- how many tests required
- point of test |
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Definition
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Term
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Definition
| # of new cases in specified time period/ initial # at risk - 1/2 Wd's during time |
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Term
| 2 facts about withdrawals with relation to disease being studied |
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Definition
| those that left study didn't develop disease, but they were at risk for it when the study started. |
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Term
| what is contained in the numerator and denominator for rate/incidence density (including withdrawals) |
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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. |
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Term
| is risk or rate the true rate, ie measuring the average speed that newly diagnosed cases of diseases are developed |
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Definition
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Term
| Give equations for Exact denominator and approximate denominator for rate |
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Definition
exact:
[image]
approximate:
[image] |
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Term
| Is prevalence or incidence higher for chronic and short term illnesses? |
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Definition
chronic disease: Prevalence > Incidence
Short term Illness: Prevalence < Incidence |
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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. |
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Definition
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Term
| relationship between prevalence, duration and incidence. (formula) |
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Definition
| prevalence = incidence X duration |
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