1
(VERIFIED EPIDEMIOLOGY)
MEASURE OF DISEASE FREQUENCY IN
EPIDEMIOLOGY SET OF QUESTIONS AND
CORRECT ANSWERS
Epidemiologic Measures
Three types: prevalence, cumulative incidence, incidence rate.
The population that we use as the base group from which we count disease
frequency.
Dynamic Population
Point Prevalence
Proportion of population that has the disease at a single point in time.
Cumulative Incidence
A measure of the proportion of a population that develops a disease over a
specified period of time.
Fixed Population
A population whose membership is defined on the basis of some event;
membership is permanent.
Incidence Rate
A measure of the frequency of new cases of a disease in a population over a
specified period of time.
Person-Years of Observation
A measure that combines the number of people in a study with the amount of time
each person spends in the study.
A population whose membership is defined by being in a state or condition;
membership is transient.
Cases of Disease
, 2
(VERIFIED EPIDEMIOLOGY)
Cases of disease = numerator of all measures of frequency; disease = ANY health
outcome (i.e., infection, defect, injury).
Size of Population
Size of population = denominator for all measures; size is based on the population
that you identified.
Importance of Size of Population
Necessary for comparison of disease across populations; cannot compare number
of cases alone.
Time in Disease Frequency
Time is necessary for all measures of disease frequency; disease occurrence can be
measured at a single point in time or over an interval of time.
Ratio
Division of one number by another; numbers do not need to be related.
Proportion
Division of two related numbers; the numerator is a subset of the denominator,
often expressed as a percentage.
Rate
Division of one number by another in which time is an intrinsic part of the
denominator.
Prevalence
Measures presence of existing cases of disease in a population during a specified
time period; numerator involves being in a state.
Methods of Disease Ascertainment
Includes clinical records, diagnostic tests, disease registries, surveillance programs,
and self-reports.
Definition of a Case
Important for determining if an individual is considered a case of a disease.
Fatalities during Skiing and Snowboarding
(VERIFIED EPIDEMIOLOGY)
MEASURE OF DISEASE FREQUENCY IN
EPIDEMIOLOGY SET OF QUESTIONS AND
CORRECT ANSWERS
Epidemiologic Measures
Three types: prevalence, cumulative incidence, incidence rate.
The population that we use as the base group from which we count disease
frequency.
Dynamic Population
Point Prevalence
Proportion of population that has the disease at a single point in time.
Cumulative Incidence
A measure of the proportion of a population that develops a disease over a
specified period of time.
Fixed Population
A population whose membership is defined on the basis of some event;
membership is permanent.
Incidence Rate
A measure of the frequency of new cases of a disease in a population over a
specified period of time.
Person-Years of Observation
A measure that combines the number of people in a study with the amount of time
each person spends in the study.
A population whose membership is defined by being in a state or condition;
membership is transient.
Cases of Disease
, 2
(VERIFIED EPIDEMIOLOGY)
Cases of disease = numerator of all measures of frequency; disease = ANY health
outcome (i.e., infection, defect, injury).
Size of Population
Size of population = denominator for all measures; size is based on the population
that you identified.
Importance of Size of Population
Necessary for comparison of disease across populations; cannot compare number
of cases alone.
Time in Disease Frequency
Time is necessary for all measures of disease frequency; disease occurrence can be
measured at a single point in time or over an interval of time.
Ratio
Division of one number by another; numbers do not need to be related.
Proportion
Division of two related numbers; the numerator is a subset of the denominator,
often expressed as a percentage.
Rate
Division of one number by another in which time is an intrinsic part of the
denominator.
Prevalence
Measures presence of existing cases of disease in a population during a specified
time period; numerator involves being in a state.
Methods of Disease Ascertainment
Includes clinical records, diagnostic tests, disease registries, surveillance programs,
and self-reports.
Definition of a Case
Important for determining if an individual is considered a case of a disease.
Fatalities during Skiing and Snowboarding
