Question

2. A. For each of the following epidemiological designs (first column) mention (fill in Column to Column)

               

Type of Design (1)	Typical Exposure -Outcome Assessment Sequence (2)	Key Identifying Characteristics (3)	Give an Example of a Study Appropriate for This Type of Design (4)
Cross-Sectional
Case-Control
Prospective Cohort Control
Experimental

B. State the main differences between the following study designs:

                i. Observational and experimental studies

                ii. Retrospective cohort and prospective cohort studies

                iii. Cohort and case-control studies

                iv. Cross-sectional and ecological studies

Answer 1

Observational	experimental study
Diverse study population is taken for the study	specific population group is taken for the study
It is just a screening study or to gather data is the main purpose For e.g. cross sectional study cohort	main purpose is to understand the effects of treatment on study group For. Eg. Randomised control trial

Retrospective	prospective
Study is usually done of the past data	infividuain are studied over the period of time
For. Eg group of 100 AIDS affected cases are studied for lifestyle and medical history to study origin of disease	for e.g 100 high risk cases are studied for the next few years to observe the development of disease.