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 Incidence = new Prevalence = existing for ... the person must be “disease free” at the start of the study period. incidence everyone is followed for the same length of time and is calculated as: C/N where: C = # new cases N = population size cumulative incidence cumulative incidence is also known as ... risk the following describes what: Number of new cases of a disease occurring in the population during a specified period of time divided by: Number of persons at risk of developing the disease during that period of time Cumulative Incidence or Risk what proportion of the people have the disease at a given point in time. Point prevalence what proportion of the people have the disease at any point in time during a specified time interval. Period prevalence what kind of prevalence is this: “Have you ever had asthma?” Cumulative Incidence what kind of prevalence is this: “Do you currently have asthma?” Point Prevalence what kind of prevalence is this: “Have you had asthma during the last 10 years?” Period Prevalence Incident Rate is: # new cases (identified period of time) / person time of people eligible to become cases how many person months is this: Person 1 contributes 4 months Person 2 contributes 8 months Person 3 contributes 2 months Person 4 contributes 12 months and how many incident cases is the above? so what is the incident rate: TOTAL Person months = 26 person months Number of incident cases = 4 4 / (26 person-months) Incidence is a measure of ... risk prevalence is not a measure of risk because it does not take into account ... the duration of the disease for a stable population: Prevalence = (what is the equation?) Incidence cases x (average) duration of disease # deaths from lung cancer in 1 year / number of persons in the population midyear (multiply the total by 1000/1000) is an example of: Cause-specific mortality rate Number of individuals dying during same specified period of time after disease onset or diagnosis divided by: Number of individuals with the specified disease in specified time period (multiply the total by 100/100) Case-Fatality Rate how does the denominator in Case-Fatality Rate differ from the denominator in the mortality rate? In contrast to mortality rate, the denominator is limited to people who already have the disease Case-Fatality rate is a measure of ... of the disease and can be used to ... severity measure new therapies