Direction of case control study
Case-control study has 3 distinct features: Both exposure and outcome have occurred before the sta of the study The study proceeds backward from effect to cause It uses a control or comparison group to suppo or refute an inference Ref: 25th edition, Park's Textbook of Preventive and Social Medicine, Page no. 79
Direction of study is reverse but time is forward
Direction of study is forward and time is also forward
Direction of study is forward and time is reverse
Direction of study is reverse and time is also reverse
Epidemiology