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20 Cards in this Set
- Front
- Back
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Incidence =
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new
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Prevalence =
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existing
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for ... the person must be “disease free” at the start of the study period.
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incidence
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everyone is followed for the same length of time and is calculated as:
C/N where: C = # new cases N = population size |
cumulative incidence
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cumulative incidence is also known as ...
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risk
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the following describes what:
Number of new cases of a disease occurring in the population during a specified period of time divided by: Number of persons at risk of developing the disease during that period of time |
Cumulative Incidence or Risk
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what proportion of the people have the disease at a given point in time.
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Point prevalence
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what proportion of the people have the disease at any point in time during a specified time interval.
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Period prevalence
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what kind of prevalence is this:
“Have you ever had asthma?” |
Cumulative Incidence
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what kind of prevalence is this:
“Do you currently have asthma?” |
Point Prevalence
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what kind of prevalence is this:
“Have you had asthma during the last 10 years?” |
Period Prevalence
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Incident Rate is:
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# new cases (identified period of time) / person time of people eligible to become cases
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how many person months is this:
Person 1 contributes 4 months Person 2 contributes 8 months Person 3 contributes 2 months Person 4 contributes 12 months and how many incident cases is the above? so what is the incident rate: |
TOTAL Person months = 26 person months
Number of incident cases = 4 4 / (26 person-months) |
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Incidence is a measure of ...
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risk
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prevalence is not a measure of risk because it does not take into account ...
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the duration of the disease
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for a stable population:
Prevalence = (what is the equation?) |
Incidence cases x (average) duration of disease
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# deaths from lung cancer in 1 year / number of persons in the population midyear
(multiply the total by 1000/1000) is an example of: |
Cause-specific mortality rate
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Number of individuals dying during same specified period of time after disease onset or diagnosis
divided by: Number of individuals with the specified disease in specified time period (multiply the total by 100/100) |
Case-Fatality Rate
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how does the denominator in Case-Fatality Rate differ from the denominator in the mortality rate?
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In contrast to mortality rate, the denominator is limited to people who already have the disease
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Case-Fatality rate is a measure of ... of the disease and can be used to ...
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severity
measure new therapies |
