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Unformatted text preview: Measures of Morbidity & Mortality Measures of Morbidity & Mortality Part 2 Dr H Stockwe Dr. H. Stockwell Measuring Mortality & Morbidity  Example: Comparing Mortality Rates ¡ Rates are commonly described as crude, specific or adjusted Crude, Category Specific and Adjusted Rates (death rates etc) ¡ Crude rates  entire population Derived by dividing the total number of Derived by dividing the total number of cases/deaths by total population ¡ Specific rates – categories of the population defined by specific characteristic such as age, sex etc Derived by dividing the number of cases/deaths in a category by the total population in that category Difficulty with Crude Rates ¡ Crude rates are difficult to compare ¡ Crude rates are difficult to compare between groups, over time etc as underlying characteristics of the populations associated with the risk of disease/death , such as age,may vary ¡ Need to adjust for these underlying differences to make comparisons Age Specific Rates Age Specific Rates Source: Gordis,L. Epidemiology, 3 rd ed. Why adjust/standardize? ¡ Need to compare two population rates but there are other differences in the population rates that would also affect the outcome of concern also affect the outcome of concern ¡ Age is a common factor that is often different iin different populations and associated with outcomes such as rates of death such as rates of death ¡ May want to compare rates in one population at two different time periods to see how much the rate has changed ¡ May want to compare two different populations at the same point in time Adjusted/Standardized rates ¡ Useful to have a single summary rate for each population that takes any differences in the structure of the population being compared into account population being compared into account ¡ Procedure is called adjustment or standardization standardization ¡ Two basic techniques: direct adjustment and indirec adjustmen adjustment and indirect adjustment Stroke death rates in Florida direct adjusted to the...
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This note was uploaded on 07/15/2011 for the course PHC 6000 taught by Professor Staff during the Summer '08 term at University of South Florida.
 Summer '08
 Staff

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