Lecture #2: Rates - 3. MEASURE OF THE INSTANTANEOUS RATE OF...

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1 TIME SPECIFIED PER CONSTANT R DENOMINATO NUMERATOR × ANATOMY OF A RATE Cases of Disease Per Some Number: 100, 1000, etc Per Some Time Interval: day, week, year, etc Includes the Sick and Well
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2 TIME SPECIFIED PER CONSTANT Risk at Pop Cases New Num × CUMULATIVE INCIDENCE RATE 1. ALL PERSONS IN THE DENOMINATOR MUST BE AT RISK 2. ALL CASES IN THE NUMERATOR MUST COME FROM THE POP IN THE DENOMINATOR 3. MEASURE OF THE RISK OR PROBABILITY OF DEVELOPING DISEASE IN THE TIME INTERVAL 4. RANGE IS BETWEEN 0 AND 1 5. ASSUMES A FIXED COHORT WITH ALL INDIVIDUALS FOLLOWED FOR THE FULL TIME INTERVAL 6. NOT AFFECTED BY TREATMENT 7. USEFUL FOR STUDYING DISEASE ETIOLOGY
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3 CONSTANT Risk at Time Person Cases New Num × PERSON-TIME INCIDENCE RATE 1. ALL PERSONS IN THE DENOMINATOR MUST BE AT RISK 2. ALL CASES IN THE NUMERATOR MUST COME FROM THE POP IN THE DENOMINATOR
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Unformatted text preview: 3. MEASURE OF THE INSTANTANEOUS RATE OF DISEASE IN THE POP 4. USEFUL WITH AN OPEN COHORT WHERE EACH PERSON POTENTIALLY CONTRIBUTES DIFFERENT AMOUNTS OF PERSON-TIME 5. NOT AFFECTED BY TREATMENT 6. USEFUL FOR STUDYING DISEASE ETIOLOGY 4 TIME SPECIFIED PER CONSTANT Pop Total Cases Num Total PREVALENCE 1. NUMERATOR REPRESENTS ALL EXISTING CASES IN POP 2. THE NUMERATOR MUST COME FROM THE POP IN THE DENOMINATOR 3. FUNCTION OF BOTH INCIDENCE AND DURATION 4. AFFECTED BY TREATMENT 5. NOT USEFUL FOR STUDYING DISEASE ETIOLOGY 6. USEFUL FOR PLANNING SERVICES 5 RELATIONSHIP BETWEEN INCIDENCE AND PREVALENCE 6 RELATIONSHIP BETWEEN INCIDENCE AND PREVALENCE 7 RELATIONSHIP BETWEEN INCIDENCE AND PREVALENCE 8 RELATIONSHIP BETWEEN INCIDENCE AND PREVALENCE...
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This note was uploaded on 05/12/2008 for the course EPI 420 taught by Professor Goldberg during the Spring '08 term at University of Washington.

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Lecture #2: Rates - 3. MEASURE OF THE INSTANTANEOUS RATE OF...

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