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epidemiology_1 introduction (response rate (good (more than 60%),…
epidemiology_1 introduction
sampling
v probabilistic
simple random sampling, stratified sampling, cluster sampling (multistage sampling)
x probabilistic
snowball sampling
casualty
random error
systemic error
selection bias
information bias
confounding
prevalence
(95% confidence intervals) disease/population at risk
incidence
new cases
epidemiological study designs
descriptive studies
case report
correlational studies
(exposure, prevalence) cross-sectional studies
analytical studies
cohort studies
case-control studies
randomized controlled trials
response rate
good
more than 60%
acceptable
40%-60%
bad
less than 40%
validity
degree to accurately measure what it purports to measure (study design) (patients) (settings)
availability
degree of access to medical goods and services
reliability
degree of stability when the measurement is repeated (sampling)