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University of Toronto Scarborough
Larry Sawchuk

Sawchuk, L. ANTC67H3 Fall 2012 Basic Health Terms and Statistics What is the difference between a rate and a proportion? Proportion: Is the fraction of the population is affected by a disease. Proportionate mortality is a commonly used proportion in epidemiology and provides the proportions of death that is caused by a specific disease. For example 30% of deaths in Canada in 2004 were caused by cancer. = number of deaths attributed to a disease in a population during a specified yearX 100 Number of deaths in the same population and year Rates: Tell us how fast the disease is occurring in a population. So, there is a time period that must be considered. The time period is arbitrary i.e. month, year(s). Some examples of rates include; crude mortality, incidence and prevalence rates. Morbidity The occurrence of illness or diseases and is calculated with the population at risk or person-time, if people at risk is observed for different period of times. Incidence and prevalence are the two measures of morbidity. Incidence: Number of new cases What are the two measures of morbidity? Provide the equations 1. 2. Mortality rates What is the crude mortality
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