Case control study method has following three distinct features. Select inappropriate one
Both exposure and outcome have occurred before the sta of the study
Unit of study is group rather than individual
The study proceeds backward from effect to cause
It uses a control or comparison group to suppo or refute an interference
Case control Study - Case control studies, often called as"retrospective studies" .It has 3 distinctive features both exposure and outcome (disease) have occurred before the sta of the study. the study proceeds backwards from effect to cause. it uses a control or comparison group to suppo or refute an inference. - In case control studies,the unit is individual rather than the group. EXTRA EDGE: UNIT OF STUDY: Coho study, Case control study, Cross sectional study - Individual Ecological study, Descriptive study - Population.
Epidemiology