ANTC67H3 Lecture Notes - Lecture 2: Health Indicator, Child Mortality, Cumulative Incidence
Document Summary
When is it difficult to define abnormal: when construct is normal distributed and when associated with several disease. Normally there is a cutoff point such as being a little over the bmi scale. Technically you are overweight since you over the amount but at the same time you are not really. Operational definition: diagnostic criteria: symptoms, signs, history and test result. Example: hepatitis is based off of presence of antibody in blood. Easy to use, measurable from standardize way, clearly and concisely articulated. Measure of morbidity: measure of disease occurrence: denominator must only include person susceptible to the disease, case count: looking number of disease without denominator (total population) Useful: quick estimate or establishing short term trends for population. Not useful: comparing different population or over a long period of time (when there is a difference in the denominator: attack rate: occurrence of disease during outbreak in a short period of time in a specific population.
