HSCI 130 Lecture Notes - Lecture 3: Prevalence, Birth Weight, Public Health
28 Feb 2019
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Population - groups of people w/ common characteristics. Fixed population - membership is permanent and defined by an event. Dynamic population - membership is transient and defined by being in or out of a state. Ie. residents of vancouver (in & out migration). Want to quantify occurrence of a disease in a pop. Take into account; # of individuals affected, size of source pop. , length of time pop. was followed. Epi needs the # and characteristics of disease cases, # of people with risk factors and of p. # of existing cases of a disease / # in total population (at a point or during a period of time. 7000 people have arthritis on jan 1st, 1999. Prevalence of arthritis on jan 1st = . 10 or 10% Numerator = number of people who are ill, symptoms or microbiological evidence of infection. Denominator = number of people who are susceptible or exposed to disease.
