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  2. Rate ratio - Wikipedia

    en.wikipedia.org/wiki/Rate_ratio

    In epidemiology, a rate ratio, sometimes called an incidence density ratio or incidence rate ratio, is a relative difference measure used to compare the incidence rates of events occurring at any given point in time.

  3. Incidence (epidemiology) - Wikipedia

    en.wikipedia.org/wiki/Incidence_(epidemiology)

    To measure incidence rate you must take into account how many years each person contributed to the study, and when they developed HIV because when a subject develops HIV he stops being at risk. When it is not known exactly when a person develops the disease in question, epidemiologists frequently use the actuarial method, and assume it was ...

  4. Hazard ratio - Wikipedia

    en.wikipedia.org/wiki/Hazard_ratio

    The hazard ratio would be 2, indicating a higher hazard of death from the treatment. To illustrate how hazard ratio is linked to projected risk: in a population where the incidence of a disease is 10% by age 65 (eg: Dementia [1] [2]), a hazard ratio of 4.42 [3] (eg: Aripiprazole medication) results in an expected incidence of 37.3% by age 65. [4]

  5. Prevalence - Wikipedia

    en.wikipedia.org/wiki/Prevalence

    The relationship between incidence (rate), point prevalence (ratio) and period prevalence (ratio) is easily explained via an analogy with photography. Point prevalence is akin to a flashlit photograph: what is happening at this instant frozen in time.

  6. Number needed to harm - Wikipedia

    en.wikipedia.org/wiki/Number_needed_to_harm

    It is defined as the inverse of the absolute risk increase, and computed as / (), where is the incidence in the treated (exposed) group, and is the incidence in the control (unexposed) group. [1] Intuitively, the lower the number needed to harm, the worse the risk factor, with 1 meaning that every exposed person is harmed.

  7. Epidemiology of diabetes - Wikipedia

    en.wikipedia.org/wiki/Epidemiology_of_diabetes

    Diabetes rates at county levels 2004 - 2009. Diabetes rates in the United States, 1994-2010. Diabetes rates in the United States, like across North America and around the world, have been increasing substantially.The diagnosis of diabetes has quadrupled in the last 30 years in America, increasing from 5.5 million in 1980 to 21.1 million in 2010 ...

  8. Infection rate - Wikipedia

    en.wikipedia.org/wiki/Infection_rate

    Calculating the infection rate is used to analyze trends for the purpose of infection and disease control. [1] An online infection rate calculator has been developed by the Centers for Disease Control and Prevention that allows the determination of the streptococcal A infection rate in a population. [2]

  9. Relative risk reduction - Wikipedia

    en.wikipedia.org/wiki/Relative_risk_reduction

    It is computed as () /, where is the incidence in the exposed group, and is the incidence in the unexposed group. If the risk of an adverse event is increased by the exposure rather than decreased, the term relative risk increase (RRI) is used, and it is computed as ( I e − I u ) / I u {\displaystyle (I_{e}-I_{u})/I_{u}} .

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