CASE CONTROL STUDY - CASE CONTROL STUDY Dr Muhammad Tareque Hasan Teaching Assistant Department of Epidemiology BUHS Case control study At the end of

CASE CONTROL STUDY - CASE CONTROL STUDY Dr Muhammad Tareque...

This preview shows page 1 - 8 out of 58 pages.

CASE CONTROL STUDY Dr. Muhammad Tareque Hasan Teaching Assistant Department of Epidemiology BUHS
At the end of the lesson we shall be able to understand- 1. Types of epidemiological study 2. What is case control study 3. Design and steps of (how to conduct) case control study 4. Features and characteristics of case control study 5. C haracteristics and qualities of controls 7. Selection criteria of case and control 8. Advantage and disadvantage of case control study 9. Difference between case control and cohort study 10.Some important discoveries of case control study. 11. How to calculate odds ratios. Case control study
Epidemiological Study Cycle DESCRIPTIVE STUDY Ca Lung increasing mostly smokers Death rates higher in populations with higher per capita cigarette consumption Ochsner, 1939 CASE CONTROL STUDY Ca Lung patients and non patients Clarifies if it was smokers who contributed to high Ca Lung Doll, 1947-52 COHORT STUDY Follows a cohort of smokers and non smokers without Ca Lung Smokers develop Ca Lung more frequently INTERVENTIONAL TRIAL (RCT) Proves hypothesis conclusively Gives inputs regarding other factors, control measures. Hypothesis: Smoking causes Ca Lung Hill, 1951-61
Analytical Studies Observational Case control (Retrospective) studies Cohort (Prospective) studies Experimental (Interventional): Animal experiments Human studies Therapeutic trials Preventive trials Difference in study groups is ONLY observed & analysed, NOT created experimentally Difference in study groups is CREATED EXPERIMENTALLY and outcomes observed
Case control study
Case control study Case control studies often called “retrospective studies” are common first approach to test causal hypothesis. The occurrence of the possible cause or exposure to a certain factor is compared between a group of person who have the disease of interest (case) with suitable matched group of person without the disease(controls). In case control studies the unit of study is individual rather than the group. The focus is on a disease or some other health problem that has already developed
Case control study cont…… Case control study has three distinct features: 1. Both exposed and out come (disease) have occurred before the start of the study.

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture