Link between smoking and cancer
{"Image DocumentName": "Case-control study GATE Frame picture & 1st acronym O", "Image ImageDescription": "smokers. E. C. non-smokers. smoking status measured. cases. yes. Here I show the stucture of a case-control study which is basically a very efficient version of a cohort study in which the investigators wait until people in a virtual cohort have had the study outcome - these people with the study outcome are known as the cases and the investigators also typically recruit a group of non cases, ideally from the same virtual cohort as the controls.. As with randomised trials and cohort studies, there is a specific presentation on case control studies later in the course. Useful study design for investigating risk factors for disease - both causes of disease and predictors of disease (including prognostic factors) O. Lung cancer. controls. no. T. Case-control study. Observational study: allocated by measurement.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}