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16 Cards in this Set
- Front
- Back
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what are common frequency measures
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ratios, proportions, and rates
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number or rate 1/ number or rate 2
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ratio
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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
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number with a particular characteristic/total number of which the numerator is a subset
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proportion
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- descriptive measures
- describe the amount of disease attributed to a particular exposure |
proportion
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- proportion of deaths in a specified population during a period of time that are attributable to different causes
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proportionate mortality
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not a rate because the denominator is all deaths
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proportionate mortality
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a measure of the frequency with which an event occurs in a defined population/
a specified period of time |
rate
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- number of new cases of disease during specified time interval/
population at start of time interval - measure of morbidity |
incidence proportion
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denominator uses population at start of time interval
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incidence proportion
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- number of new cases among contacts/total number of cases
- proportion - measure of morbidity |
secondary attack rate
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- # new cases during specified time interval/summed person years of observation of average population
- measure of morbidity |
incidence rate (person-time rate)
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- number of current cases (new and pre-existing)/population at a point in time
- proportion - measure of morbidity |
point prevalence
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- number of current cases/ average or mid-interval population
- ratio - measure of morbidity |
period prevalence
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1) incidence proportion
2) secondary attack rate 3) incidence rate 4) point prevalence 5) period prevalence |
measures of morbidity
(Table 3.3) |
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measure of morbidity that uses average or mid-interval population
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period prevalence
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