Disease frequency Flashcards
1
Q
What is prevalence?
A
-Proportion of existing disease in the population at a given time
2
Q
What is incidence?
A
-Occurrence of new cases in a population at risk over time
3
Q
What is cumulative incidence? (incidence proportion)
A
- the number of new cases per person in the population over a defined period of time.
4
Q
What is incidence rate?
A
- the number of new cases per unit of time (“rate”).
5
Q
How do you calculate all 3?
A
6
Q
Look at patterns of prevalence and incidence.
A
7
Q
Look at what happens when a vaccine is introduced.
A
8
Q
Why do we need prevalence and incidence ?
A
-Prevalence : treatment is working
-Incidence: prevention is working
- think about a cure both in terms of preventing new diagnoses and treating existing diagnoses
9
Q
Incidence decreases but prevalence increased, why?
A
-Good public health
-Better management of risk factors
-Changes in healthcare i.e improved primary care
-Migration
-Lifestyle changes
