# Measures of Disease Occurrence Flashcards

Risk factor is another word for what?

Determinant of disease.

When it comes to measuring disease, epi is concerned with what?

the presence of existing health problems in a pop, the occurrence of new health events in a pop, and their measurement.

What is important to define when measuring disease occurrence?

what is being measured, the persons or animals included in said measurement, place or location of the study pop, time period of the study.

Who is the study population?

the subjects in the study, usually the sample size from a population.

Who is the source pop?

pop from which the subjects were drawn

Who is the target pop?

pop to which you may want to generalize your results.

What are the most common types of measures in epidemiology?

counts, proportions, ratios, and rates.

What does a count represent?

Represents the # of animals w/ a dz. Conveys little info due to lack of denominator.

Proportions represent what? Which is the most commonly used proportion?

The number of dzd animals divided by the total # of animals in the study. The #s in the numerator are also in the denominator. Most commonly used: prevalence.

What are ratios? Which is the most commonly used in epi?

a fraction in which the numerator is not part of the denominator. Most commonly used: odds.

What is a rate?

the # of new occurrences of dz (cases) divided by # of animals in study within a specified time frame.

What are the most commonly used rates in epi?

cumulative incidence and incidence rate.

What is prevalence?

the proportion of the study pop that is dzd at any one time. Gives you info on how frequently you may see a dz in your practice.

What is the difference between point prevalence and period prevalence?

point prevalence: proportion of study pop dzd at a single point in time, while period prevalence is the porportion of study pop dzd during a specified period of time.

What is incidence?

the # of new cases of dz that occur in the study pop over time.