POPM 3240 Lecture Notes - Lecture 18: Flu Shot (30 Rock), Influenza Vaccine, Prevalence
23 Apr 2019
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To study transmission of disease, we must measure its occurrence. Various measures possible: counts, ratios, proportions, risks, rates. Note: they"re not synonymous (despite what may be read) Counts (uncommon): the number with the outcome of interest. Ratios (uncommon in measuring disease frequency): value obtained by comparing one count to another. Proportions: number with disease divided by population size. Numerator is part of the denominator; decimal points, fractions, percentages. Eg. prevalence of disease is %% in a given population. Risks: proportions; express probability that something will occur. Eg. incidence risk of disease: the probability of contracting the disease over a given time period (eg. risk of disease = 5%) Rates: an expression of an event occurrence in a defined population in a specified period of time; measures speed . Eg. rate of disease is 2 cases per cow-month. In january, 229 students completed class survey question on getting the flu shot. 54 reported receiving the flu shot in previous 12 months.
