hsci 230 midterm questions with complete solutions

What is epidemiology? correct answer: epidemiology is the study of occurrence and determinants of disease - definition is evolving overtime - who what when why -It is a way of thought: alert to the potential for error, and willing to consider alternative explanations. What is epidemiology used for? correct answer: epidemiology helps to create policies and medical decisions because they aid in finding: - finding who is developing the disease and where and when and why they are developping it Attack rate correct answer: - calculates the percentage of who became ill among those exposed ( like at the food) attack rate = (people sick and exposed / total exposed) - percentage Relative risk correct answer: Evaluates the strength of association - by measuring the risk of disease in those exposed compared to those unexposed - relative risk = (Risk (attack rate) of illness in those who ate hot chicken) / (Risk (attack rate) of illness in those who did NOT eat hot chicken) also known as a rate ratio How to relay relative risk correct answer: - We interpret this as "The risk of illness among those who ate hot chicken (exposed) is 1.4 times the risk of illness among those who did not (unexposed)". What is an epidemic? correct answer: - an epidemic is any notable excess of disease • a widespread occurrence of an infectious disease in a community at a particular time - Doesn't have to be an infectious disease could be lung cancer what are the key questions asked when studying epidemics? correct answer: 1. What disease is present in excess? 2. Who is ill? 3.Where do they live? 4. When did they become ill?