Prospective
Analytical =>testing relationships between
common traits and outcomes; Answer why and how
Observational
Subtopic
Cohort study
-longitudinal design
-Exposure measured at
"baseline"
-Disease status assessed
at "follow-up"
-Forward looking study
outcome
Ambidirectional
Retrospective
Case-Control Study
-Cases&Controls may
differ in xtics/exposures
Cross-sectional
study
Case-Crossover
Study and others
Experimental: Clinical Trial
Community (randomized
controlled trial)
Epidemiological Studies
Descriptive =>describes frequency or
characteristics of events; Generates
Hypotheses; Answers what, who,
where and when
Case Report
Case Series
Ecologic Study
Incidence registry
Descriptive component of
cross-sectional survey
