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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 (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