پاورپوینت اندازه گیری ها در اپیدمیولوژی (pptx) 79 اسلاید
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اندازه گیری ها در اپیدمیولوژی
Incidence بروز
The number of new cases of disease that occur during a specified period of time in a population at risk for developing the disease
Measure of the probability that unaffected persons will develop the disease
Steps:
identify a population that is free of the disease
follow the population over time
Incidence بروز
Formula:
Example:
( 23 Cases per 1000 women during 5 years )
Measurement of Morbidity
1385
Prevalence
Prevalence شیوع
Formula:
Example:
( 2.3 Cases per 1000 persons )
Figure 7.4
Incident cases
Deaths, emigrations and recovery
Prevalent cases
Measure of Disease Association
Ratios:
rate ratio, risk ratio or relative risk (all abbreviated RR)
odds ratio (OR),
Difference measurements of disease frequencies include: attributable risk
انواع مطالعات
اپيدميولوژی
تجربي
(مداخله ای)
مشاهده اي
توصيفي
تحليلي
Case report
Case series
Cross sectional
(Survey)
Cohort
Case-Control
Randomized
controlled trials
Quasiexperimental (Non randomized or non control trial)