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Enumeration and Tabulation
Listing all the data and creating a frequency table.

Histogram
A bar chart used for continuous variables.

Line Graph
Used to display trends.

Pie Chart
A circle that shows the proportion of cases according to several categories.

Percentage
A proportion multiplied by 100.

Proportion
A type of ratio in which the numberator is part of the denominator.

Ratio
The value obtained by dividing one quanitity by another.

Rate
Also a type of ratio, denominator involves a measure of time.

Count
Total number of cases of a disease or other health phenomenon being studied.

Period Prevalence
All cases of a disease within a period of time. When expressed as a proportion, refers to the number of cases of illness during a time period divided by the average size of the population.

Point Prevalence
Number of caes of illness in a group or population at a point in time divided by the total number of persons in that group or population.

Prevalence
Number of existing cases of a disease or health condition in a population at some designated time.

Incidence
the occurrence of new disease or mortality within a defined period of observation in a specified population.

Incidence Rate
Number of new cases of a disease, or other condition, in a population divided by the total number of population at risk over a time period, times a multiplier.

Population at Risk
Those members of the population who are capable of developing a disease or condition.

Reference Population
Group from which cases of a disease have been taken; also refers to the group to which the results of a study may be generalized.

Case Fatality Rate
Number of deats caused by a disease among those wh ohave the disease during a time period.

Crude Rate
A summary rate based on the actual number of events in a population over given time period.

Death rate
Approximates the proportion of a dpopulation that dies during a time period of interest.

Specific rate
Statistic referring to a particular subgroup of the population defined in terms of age, race, or sex; also may refere to the entire population but is specific to some single cause of death or illness.

Adjusted rate
Rate of morbidity or mortality in a population in which statistical procedures have been applied to permit fair comparisons across populations by removing the effect of differences in the composition of various populations.

Cause Specific Rate
A measure that refers to mortality divided by the population size at the midpoint of a time period times a multiplier.

AgeSpecific rate
the number of cases per age group of a population during a specified time period

SexSpecific Rate
The frequency of a disease in a gender group divided by the total numer of persons in that gender group during a time period times a multiplier.

