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20 Cards in this Set

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Incidence =
Prevalence =
for ... the person must be “disease free” at the start of the study period.
everyone is followed for the same length of time and is calculated as:


C = # new cases
N = population size
cumulative incidence
cumulative incidence is also known as ...
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
what proportion of the people have the disease at a given point in time.
Point prevalence
what proportion of the people have the disease at any point in time during a specified time interval.
Period prevalence
what kind of prevalence is this:

“Have you ever had asthma?”
Cumulative Incidence
what kind of prevalence is this:

“Do you currently have asthma?”
Point Prevalence
what kind of prevalence is this:

“Have you had asthma during the last 10 years?”
Period Prevalence
Incident Rate is:
# new cases (identified period of time) / person time of people eligible to become cases
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)
Incidence is a measure of ...
prevalence is not a measure of risk because it does not take into account ...
the duration of the disease
for a stable population:

Prevalence =

(what is the equation?)
Incidence cases x (average) duration of disease
# 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
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
how does the denominator in Case-Fatality Rate differ from the denominator in the mortality rate?
In contrast to mortality rate, the denominator is limited to people who already have the disease
Case-Fatality rate is a measure of ... of the disease and can be used to ...
measure new therapies