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16 Cards in this Set
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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
