 Shuffle Toggle OnToggle Off
 Alphabetize Toggle OnToggle Off
 Front First Toggle OnToggle Off
 Both Sides Toggle OnToggle Off
 Read Toggle OnToggle Off
Reading...
How to study your flashcards.
Right/Left arrow keys: Navigate between flashcards.right arrow keyleft arrow key
Up/Down arrow keys: Flip the card between the front and back.down keyup key
H key: Show hint (3rd side).h key
A key: Read text to speech.a key
Play button
Play button
16 Cards in this Set
 Front
 Back
what are common frequency measures

ratios, proportions, and rates

number or rate 1/ number or rate 2

ratio

number of deaths attributed to a particular disease during a specified period/
number of new cases of disease during the same period 
death to case ratio

number with a particular characteristic/total number of which the numerator is a subset

proportion

 descriptive measures
 describe the amount of disease attributed to a particular exposure 
proportion

 proportion of deaths in a specified population during a period of time that are attributable to different causes

proportionate mortality

not a rate because the denominator is all deaths

proportionate mortality

a measure of the frequency with which an event occurs in a defined population/
a specified period of time 
rate

 number of new cases of disease during specified time interval/
population at start of time interval  measure of morbidity 
incidence proportion

denominator uses population at start of time interval

incidence proportion

 number of new cases among contacts/total number of cases
 proportion  measure of morbidity 
secondary attack rate

 # new cases during specified time interval/summed person years of observation of average population
 measure of morbidity 
incidence rate (persontime rate)

 number of current cases (new and preexisting)/population at a point in time
 proportion  measure of morbidity 
point prevalence

 number of current cases/ average or midinterval population
 ratio  measure of morbidity 
period prevalence

1) incidence proportion
2) secondary attack rate 3) incidence rate 4) point prevalence 5) period prevalence 
measures of morbidity
(Table 3.3) 
measure of morbidity that uses average or midinterval population

period prevalence
