incidence + prevlance

Question 1

define prevlance

Answer 1

Prevlance is the total number of cases of a disease at a particular time period,
often measured with a cross sectional survay

Question 2

How do you calculate the number of cases per 1000

Answer 2

calculate the proportion unwell at a given time point (prvalnce)
multiply by 1000

Question 3

what factors impact the rate of prevelance

Answer 3

The incidence of the disease
Duration of the disease

Question 4

what is the incidence vs CI

Answer 4

incidence = the frequency of new cases of a disease, general term for all types of incidence
CI = the freqency of new cases of a diseases given a particular time period

Question 5

How to calculate CI

Answer 5

number of cases developed / total people at risk
alongside a specified time period

Question 6

what does a kaplin meier curve show

Answer 6

the number of people who dont have the disease at a time graphed

Question 7

how to calculate incidence rate

Answer 7

Calculate poeple years
- total number of years people are at risk, exculdes once you have the disease or after you are lost to follow up
number developed illness / people years = incidence rate

Question 8

Can people lost to follow up still have relivant info

Answer 8

Yes, the time before they left can be included in the incidence rate - people years. use of right censored data