Rates Flashcards
1
Q
what is a ratio
A
expressed relationship between two numbers
2
Q
what is proportions
A
type of ratio in which numerator is included in denominator
3
Q
what is a special form of proportion that included specification of time
A
Rate
4
Q
what determines prevalence
A
incidence and duration of disease P= (I)(D)
5
Q
what is point prevalence
A
of cases existing at single point in time / population at risk at that point in time X 1000
6
Q
what is period prevalence
A
of cases existing over time interval / estimated mid-interval population X 1000
