Example HS 300 Epidemiology Incidence Rate Calculation Incidence rate IRc

# Example hs 300 epidemiology incidence rate

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Example: ………………. HS 300 Epidemiology
Incidence Rate Calculation   Incidence rate (IRc)= Number of new cases over a time period  x multiplier              Total population at risk HS 300 Epidemiology Incidence Rate =Number of new cases over a time period x multiplier Total population at risk Number of new cases = 1,085 Population at risk = 37,105 1,085 37,105 = 365.5 cases per 100,000 women per year Incidence Rate =    = 0.02924/8 = 0.003655 x 100,000
Outbreak of Meningococcal Infections  in a Class of 10 Students Students Jul 5 Jul 14 A B C D E F G H I J Day Su M Tu W Th F Sa Su M Tu W Th F Sa Duration of Illness
Incidence What to do when members of a population or study group are  under observation for different lengths of time? –> incidence  density Example: …….. HS 300 Epidemiology
HS 300 Epidemiology Number of new cases during the time period Total person-time of observation Incidence density = Number of new cases during the time period Total person-years of observation Incidence density = If period of observation is measured in years, formula becomes: Formulas for Incidence Density
60 cases of colon cancer were reported in 5 year  study of 311 study subjects. 10 subjects  developed colon cancer and 40 dropped out of  study after one year, 35 new cases were  reported at end of year two; no cases, but 4  subjects dropped out at end of year three, 10  new cases and 12 subjects dropped out at end  of year four, and 5 new cases were reported at  end of year 5.  What was the incidence of colon cancer in this  study per 100 person-years? HS 300 Epidemiology
Step 1: Calculate the total person-years of observation in this  study……………………….. HS 300 Epidemiology
Person-Years of Observation Study of  Subjects in 5 year Colon Cancer  Study Number of Subjects                (A) Length of  Observation               (Years)  (B) Person-Years  (A X B)             50 1 50             35 2 70              4 3 12              22 4  88            200 5 1,000 Totals  subjects 311 1,220 Person-Years HS 300 Epidemiology

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