Epi Unit One Formulas
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14 terms
Terms | Definitions |
|---|---|
 ratio | magnitude or problem of a / magnitude or problem of b - a and b are mutually exclusive |
| proportion | a / a+b with no time element |
| rate | number of events/population at risk per 1000 over specified time period |
| point prevalence | number of existing cases of disease at a given time / total population (sick and healthy) at that same time |
| period prevalence | all cases at beginning of time + new cases during that time / everyone in the population (sick and healthy) |
| lifetime prevalence rate | the proportion of inds. in a population who have a disease at any point in their life |
| incidence | # new cases of a disease / # of disease events occurring in a defined population during a specified time period |
| incidence rate | # new cases / population @ risk of disease |
| cumulative incidence rate | # new disease cases / total population at risk - prevalent (existing) cases |
| incidence density/incidence rate | # new cases during time period / total person-time of observation |
| prevalence rate | incidence rate X disease duration |
| survival rate | # newly diagnosed - # deaths observed in a group / # newly diagnosed in time frame |
| pair matched odds ratio | b/c |
| unmatched case control study odds ratio | ad/bc |
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