Follow up prospectively with exposure at outset
cohort study
what does a cross sectional study tell you?
incidence/prevalence
nature of sampled population
What does case-control tell you?
what CAUSES the outcome/risk factor you want to know
What does cohort tell you?
what are the EFFECTS of the RF/exposure
what does an interventional study tell you?
what is the EFFECT of the INTERVENTION specified
Clinical enquiry: treatment effectiveness
pragmatic RCT
Clinical enquiry: treatment efficacy
experimental RCT
Clinical enquiry: causation/aetiology
case-control or cohort
Clinical enquiry: prognosis
cohort
Clinical enquiry: diagnostic assessment/evaluating new tool
cross sectional comparison to gold standard
Clinical enquiry: health economics
cost-effectiveness study
Clinical enquiry: meaning or health experience
qualitative study
how do cohort studies that are retrospectively vs prospectively applied differ?
only in time set that data is from ie sample sizes are not necessarily different
what is more expensive case control or cohort?
Cohort