Introduction to study designs - case-control studies | Health Knowledge

 

case control study ppt

health regions in Britain were selected for the study if diagnosis was made before their 36 th birthday. One control per case, matched for age, was selected at random from the list of the case's general practitioner. Age matching was achieved by selecting control pairs who’s date of birth was at most six months apart from the respective case. A. Dec 06,  · Case-control study design. Cases should be selected based on objective inclusion and exclusion criteria from a reliable source such as a disease registry. An inherent issue with selecting cases is that a certain proportion of those with the disease would not have a formal diagnosis, may not present for medical care, may be misdiagnosed or may. Dec 29,  · Case-Control Studies A case control study involves two populations – cases and controls and has three distinct features: Both exposure and outcome have occurred before the start of the study. The study proceeds backwards from effect to cause. It uses a control or comparison group to support or refute an inference.


CASE CONTROL STUDY


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WordPress Shortcode. Full Name Comment goes here. Are you sure you want to Yes No. Jabessa Hatahu, case control study ppt. Sohail Aziz. Show More. No Case control study ppt. Views Case control study ppt views. Actions Shares. Embeds 0 No embeds. No notes for slide. Hypothesis: Smoking causes Ca Lung Hill, 7. Analytical studies History of medicine has always been fascinated in discovering the causes of case control study ppt disease and the ways in which these could be modified.

Dictionary of Epidemiology: 3rd ed; John M Last. Type 2 Pair matching: It is finding a control for particular case as closely resembling as possible except for disease under study. Selecting good data on exposure 1. Bias in case control studies BIAS — is a systematic error in design, conduct or analysis of a study which leads us to an erroneous conclusion. Bias in selection of cases - selection bias or diagnostic bias 2.

Bias in investigating controls. Problems due to over matching : - This is where a potential confounder religion in substance abuse is matched among cases and controls. The study thus loses the power of proving an obvious association. Bias in analysis - the presence of a confounder is mostly identified at the time of analysis.

Solution — Stratification limit the size of study and no of confounding factors Essentials of Public Health Dentistry. New Delhi: Arya Publising House; You just clipped your first slide! Clipping is a handy way to collect important slides you want to go back to later. Now customize the name of a clipboard to store your clips. Visibility Others can see my Clipboard. Cancel Save.

 

Case Control - Study Design

 

case control study ppt

 

Case–control studies are therefore placed low in the hierarchy of evidence. Examples. One of the most significant triumphs of the case–control study was the demonstration of the link between tobacco smoking and lung cancer, by Richard Doll and Bradford Hill. health regions in Britain were selected for the study if diagnosis was made before their 36 th birthday. One control per case, matched for age, was selected at random from the list of the case's general practitioner. Age matching was achieved by selecting control pairs who’s date of birth was at most six months apart from the respective case. A. Dec 29,  · Case-Control Studies A case control study involves two populations – cases and controls and has three distinct features: Both exposure and outcome have occurred before the start of the study. The study proceeds backwards from effect to cause. It uses a control or comparison group to support or refute an inference.