Contents
- 1 What factors need to be considered when interpreting geographic distributions?
- 2 What type of epidemiology looks at distributions?
- 3 What is an example of geographic distribution?
- 4 What are the roles of geographic distribution?
- 5 What are the 5 W’s of descriptive epidemiology?
- 6 What is the geographic distribution of the United States?
- 7 How is the person time rate related to the incidence rate?
- 8 How is the incidence rate different from the denominator?
What factors need to be considered when interpreting geographic distributions?
analysis of the disease incidence depend on the following factors:
- The size of the area under discussion (scale)
- Data availability.
- Data geographical location (georeference)
- Data geographical discontinuity.
- Data source (taking into consideration that because of their nature –i.e. being.
What type of epidemiology looks at distributions?
In the definition of epidemiology, “distribution” refers to descriptive epidemiology, while “determinants” refers to analytic epidemiology. So “distribution” covers time (when), place (where), and person (who), whereas “determinants” covers causes, risk factors, modes of transmission (why and how).
What are the three most important characteristics of descriptive epidemiology?
Descriptive epidemiology searches for patterns by examining characteristics of person, place, & time . These characteristics are carefully considered when a disease outbreak occurs, because they provide important clues regarding the source of the outbreak.
What is the study of geographical distribution?
Biogeography, the study of the geographic distribution of plants, animals, and other forms of life.
What is an example of geographic distribution?
Geographical distribution is the natural arrangement of animals and plants in particular regions. For example. wild potatoes are found in significant numbers along the west coast of South America and Central America. In other instances animals from the same species, get seperated, and therfore grow in different places.
What are the roles of geographic distribution?
Geographic distributions are thus a function of a range of morphological and physiological adaptations of individual organisms, characteristics acquired through the process of natural selection.
What are the 5 W’s of epidemiology?
The difference is that epidemiologists tend to use synonyms for the 5 W’s: diagnosis or health event (what), person (who), place (where), time (when), and causes, risk factors, and modes of transmission (why/how).
What are the 3 major types of epidemiological studies?
Three major types of epidemiologic studies are cohort, case-control, and cross-sectional studies (study designs are discussed in more detail in IOM, 2000). A cohort, or longitudinal, study follows a defined group over time.
What are the 5 W’s of descriptive epidemiology?
What is the geographic distribution of the United States?
People. Geographic Distribution of U.S. Population. In 2000 almost two-thirds of the U.S. population lived in states along the three major coasts—38 percent along the Atlantic Ocean, 16 percent along the Pacific Ocean, and 12 percent along the Gulf of Mexico.
How are prevalence and incidence similar and different?
So prevalence and incidence are similar, but prevalence includes new and pre-existing cases whereas incidence includes new cases only. The key difference is in their numerators. The numerator of an incidence proportion or rate consists only of persons whose illness began during the specified interval.
How to calculate the incidence proportion of a disease?
EXAMPLES: Calculating Incidence Proportion (Risk) Example A: In the study of diabetics, 100 of the 189 diabetic men died during the 13-year follow-up period. Calculate the risk of death for these men. Numerator = 100 deaths among the diabetic men Denominator = 189 diabetic men 10 n = 10 2 = 100. Risk = (100 ⁄ 189) × 100 = 52.9%
The denominator of the person-time rate is the sum of all of the person-years for each study participant. So, someone lost to follow-up in year 3, and someone diagnosed with the disease in year 3, each contributes 2.5 years of disease-free follow-up to the denominator. An incidence rate describes how quickly disease occurs in a population.
How is the incidence rate different from the denominator?
However, the denominator differs. The denominator is the sum of the time each person was observed, totaled for all persons. This denominator represents the total time the population was at risk of and being watched for disease. Thus, the incidence rate is the ratio of the number of cases to the total time the population is at risk of disease.