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16 Cards in this Set

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  • 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 (person-time rate)
- number of current cases (new and pre-existing)/population at a point in time
- proportion
- measure of morbidity
point prevalence
- number of current cases/ average or mid-interval 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 mid-interval population
period prevalence