CROSS SECTIONAL STUDY
CASE CONTROL STUDY
COHORT STUDY
RANDOMISED CONTROL TRIALS
Safe
Work
Improvement
Market
swim
if studying exposure = COHORT
if studying disease = CASE CONTROL
COHORT STUDY
what is incidence
what is prevalence
relative risk :
<1 (decreases diseases)
1. no relation
>1 (increases disease)
p values