Shared Flashcard Set

Details

(Chapter 2) Environmental Epidemiology
Essentials of Environmental Health 2nd Edition Baylor University
25
Environmental Studies
Undergraduate 3
02/24/2013

Additional Environmental Studies Flashcards

 


 

Cards

Term
environmental epidemiology
Definition
study of diseases and health conditions (occurring in the population) that are linked to environmental factors
Term
epidemiology's contribution to environmental health
Definition
--concern with populations
--use of observational methods
--methodolgy for study designs
--descriptive and analytic studies
Term
concern with populations
Definition
environmental epidemiology studies a population in relation to morbidity and mortality
Term
use of obervational data
Definition
epidemiolgy is primarily an observational science that takes advantage of naturally occurring situations in order to study the occurrence of disease
Term
methodology for study designs
Definition
1. cross-sectional
2. ecologic
3. case-control
4. cohort
Term
2 classes of epidemiologic studies
Definition
1. descriptive
2. analytic
Term
descriptive studies
Definition
depiction of the occurrence of disease in populations according to classification by person, place, and time variables
Term
analytic studies
Definition
examine causal (etiologic) hypotheses regarding the association between exposures and health conditions
Term
prevalence
Definition
measure of disease frequency and refers to existing cases of disease or deaths
Term
point prevalence
Definition
--refers to all cases of a disease that exist at a particular point in time relative to a specific population from which the cases are derived

-- Point prevalence = (number of persons ill) / (total number in the group) at a point in time
Term
incidence
Definition
the occurrence of a new disease or mortality within a defined period of observation (week, month, year, etc) in a specific population

-- incidence rate = (number of new cases / total population at risk) over a time period x multiplier (e.g. 100,000)
Term
Case fatality rate
Definition
--provides a measure of the lethality of a disease

-- CFR (%) = (number of deaths due to disease "X" / number of cases of disease "X") x 100 during a time period
Term
John Snow
Definition
--english anesthesiologist who linked cholera outbreak in London to contaminated water from the Thames River in the mid-1800s

--used a natural experiment, commonly used today by environmental epidemiology

--miasma theory vs. fecal/oral transmission

--spatial analysis
Term
Sir Percival Pott (1714-1788)
Definition
--London surgeon thought to be the first individual to describe an environmental cause of cancer

--chimney sweeps had high incidence of scrotal cancer due to contact with soot
Term
Odds Ratio (OR)
Definition
--a measure of association for case-control studies

--exposure-odds ratio - ratio of odds in favor of exposure among the disease group (the case) to the ratio in favor of exposure among the no-disease group (the control)
Term
relative risk
Definition
ratio of the incidence rate of a disease or health outcome in an exposed group to the incidence rate of the disease or condition in a non-exposed group
Term
study endpoints
Definition
--self-reported symptom rates
--physiologic or clinical examinations
--mortality
Term
epidemiologic triange
Definition
--host, environment, agent

--one of the fundamental models of causality used in epidemiolgic studies

--provides a framework for organizing the causality of other types of environmental problems
Term
host
Definition
a person or other living animal, including birds or arthropods, that affords subsistence or lodgement to an infectious agent under natural conditions
Term
agent
Definition
a factor--such as a microorganism, chemical substance, or form of radiation--whose presence, excessive presence, or (in deficiency diseases) relative absence is essential for the occurrence of a disease. A disease may have a single agent, a number of independent alternative agents (at least one of which must be present) or a complex of two or more factors whose combined presence is essential for the development of the disease
Term
environment
Definition
domain in which the disease-causing agent may exist, survive, or originate. consists of "all that is external to the individual human host"
Term
causality
Definition
--a causal association must exist between an agent factor and disease in the host for there to be causality

--certain criteria need to be taken into account in the assessment of causal association between factor A and disease B
Term
Hill's Criteria of Causality
Definition
1. strength
2. consistency
3. specificity
4. temporality
5. biological gradient
6. plausibility
7. coherence
Term
bias in epidemiologic studies
Definition
--bias: deviation of results or inferences from the truth, or processes leading to such deviation. any trend in the collection, analysis, interpretation, publication, or review of data that can lead to conclusions that are systematically different from the truth

--healthy worker effect: source of bias that results from the fact that employed populations tend to be healthier than the general population

--confounding: a situation in which a measure of the effect of an exposure with other factors that influence the outcome under study
Term
limits of epidemiologic studies
Definition
1. long latency periods
2. infrequent occurrence of certain diseases
3. difficulties in exposure assessment
4. nonspecific effects
Supporting users have an ad free experience!