EPI 320 Study Guide - Midterm Guide: Intermittent Energy Source, Case Fatality Rate, Relative Risk
Document Summary
Concepts basics: exposure: what we think will lead to the outcome, outcome: result of exposure, population: group we observe/measure the outcome group for generalization of results, ex: smoking lung cancer. # of persons infected: +: quick and easy, -: may have misinterpretations (watch denominator) Proportions attack rate: what proportion of those exposed to the disease were infected, # of person infected / # persons exposed, ex: 100 people ate egg salad, 25 got sick 25% rate. Proportions point prevalence: snap of existing cases/proportion of people w disease at time x, no units, can be decimal or percent, measures of burden of disease, # existing cases of disease/# persons observed (pop of interest) Calculating denominators for incidence rate: (1) mean-follow up time, total person-time = total # of people in pop x average follow-up time, ex: at year 1. 5, city x had pop of 500,000. You follow disease y in city x over three years.
