refers to the occurrence in a community or region go cases of illness specific health related behavior or other health related events clearly in excess of normal expectancy.
occurring worldwide or over a very wide area crossing international boundaries and usually affecting a large number of people
concerned with distribution and determinants of health and disease and morbidity in populations.
implies that the occurrence of diseases and other health outcomes varies in population with some subgroup of the population more frequently affected than others.
which pertain either to contact with a disease-causing factor or to the amount of that impinges upon a group or individuals.
natural history of disease
refers to the course of disease from its beginning to its final clinical endpoints.
takes place during the early phases of pathogenesis includes activities that limit the progression of disease.
directed toward the later stages of pathogenesis includes programs for restoring the patient's optimal functioning.
that capitalizes upon naturally occurring situations in order to study the occurrence of disease.
refers to epidemiologic studies that are concerned characterizing the amount of distribution of health and disease within a population.
suggested that environmental factors such as water quality and the air implicated in the causation of diseases.
black death was thought to be an epidemic of bubonic plague a bacterial disease caused by yersinia petis.
founder of the field occupational medicine. also considered to be a pioneer in the field of ergonomics by pointing out the hazards associated with postures assumed in various occupations.
Sir Percival Pott
surgeon is thought to be the first individual to describe an environmental cause of cancer.
findings regarding the development of a vaccine that provided immunity to smallpox were published.
the probability that an event will occur an individaul will become ill or die within a stated period time or by a certain age.
is an exposure that is associated with a disease morbidity or morality or adverse health outcomes.
of ration in which the numerator is part of the denominator proportion may be expressed percentages.
refers to the occurrence of new disease or mortality within a defined period of observation
denotes the rate formed by dividing number or NEW CASES that occur during a time period by the number of INDIVIDUALS in the population at risk.
refers to the number of existing cases of a disease or health condition or deaths in a population at some designated time.
refers to all cases of a disease health condition or death that exist at a particular point in time relative to a specific population from which the cases are derived.
point of prevalence math prob.
point of prevalence= number of person ill/ total number in the group. (at a point in time)
Rate calculation (crude death rate)
number of deaths in a given year divide by reference population (during midpoint of the year) X 100,000
Age specific rate
number of deaths among those aged 15-24/ number of person who are aged 15-24 during period of time X 100,000
representativeness aka external validity
refers to the generalizability of the findings to the population from which the data have been taken.
public health surveillance
refers to the systematic and continuous gathering of information about the occurrence of disease and other health phenomena
using health related data that precede diagnosis and signal a sufficient probability of a case or an outbreak to warrant further public health response.
refers to the number of years that a person is expected to live at any particular year.
number of deaths assigned to causes related to childbirth/ number of live births X 100,000
infant mortality rate
defined as the number of infant deaths among infants aged zero to 365 days during a year divided by the number of live births during the same year