Cohort Essay

733 Words2 Pages

MAIN ELELMENTS OF DESIGN
In order to establish a cohort study design a clear research question and hypothesis must be established. In this case our research question was what effects does alcohol consumption have on the development of bladder cancer? The next step would be to choose our source population. The decision on which group will serve as source population depends on numerous factors. This includes expenses, accessibility, traceability and whether or not it correlates with your hypothesis. In this study I have chosen to focus on a cohort of 100,000 men from Germany ages 55-75 and were followed up for a twenty year period. Women were not included in the study because of the fact they have a much lower chance of developing bladder …show more content…

Bias is just simply an error in how a study may be designed or conducted and may appear in many different forms. One of the most common forms of bias is selection bias. “Selection bias is an error that occurs usually in the beginning of the study where there are differences in the characteristics of those who participate in the study and those who do not. Although this type of bias usually appears in case control studies it may also occur in some cohort studies as well” (Aschengrau 270). In this specific study selection bias may appear through the data gathering process. Since we have chosen to use a questionnaire as our chosen data source there is always the possibility that participants may refuse or not respond to some of the questions listed on the questionnaire. This is known as self selection bias. Another form of bias that may appear is measurement bias. Measurement bias is just an under or overestimation of the true value of what we are attempting to measure and this is known as systematic error. Systematic error can appear in questionnaires especially those that are not well designed. For example if our questionnaire were to ask too many difficult or open ended questions this may end up contributing to measurement

More about Cohort Essay

Open Document