Review for Midterm #1: Additional Slides

# Review for Midterm #1: Additional Slides - REMINDERS 1...

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REMINDERS 1. PRACTICE PROBLEMS See website Will post answers to adjustment questions and Review slides by tomorrow 2. OFFICE HOURS Yuzo: Mon 1 – 3pm Zoe: Sun 1 – 3pm, Suzallo Cafe Britton: Mon 11 - 1pm 3. MIDTERM Mon Apr 28, 3:30-5:20pm lecture hall T739, T747 Bring a #2 pencil and simple calculator

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Epi 420 Midterm Review Classification of Disease Snow on Cholera Rates, Descriptive Epidemiology and Patterns of Disease Measures of Disease Adjustment of Rates Infectious Disease – Outbreak Investigation
Epi 420 Midterm Review Review of Rates

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Left/Ambidextrous N = 43 Right N = 405 Fracture N = 17 Fracture N = 116 No Fracture N = 26 No Fracture N = 289 EPI420 students who completed survey N = 448 Are left-handed and ambidextrous EPI420 students at higher risk of fracture? Left/Ambi: 17/43 = 40 per 100 Right: 116/405 = 29 per 100
Remember denominator : You want to know the size of the population at risk. Unexposed Exposed Rate per 100 Size of Population at Risk # Outcomes Group Lefties Righties Number of Fractures Fracture Rate per 100 students No. of Lefties with history of fracture No. of All Lefties No. of Lefties with history of a fracture No. of All Lefties ÷ No. of Righties with history of fracture No. of All Righties No. of Righties with history of fracture No. of All Righties ÷

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Unexposed (Right) Exposed (Left/Amb) Rate per 100 Size of Population at Risk # Outcomes (Fractures) Group 17/43 x 100 = 40 per 100 students 43 289 116/289 x 100 = 29 per 100 students 17 116 What kind of frequency is this? Prevalence
Are left-handed and ambidextrous EPI420 students at higher risk of fracture? Cohort 2008 z N = 123 survey respondents z 2 ambidextrous, 1 has had fracture: z 50 per 100 z 9 left-handed, 3 have had fractures: z 33 per 100 z 112 right-handed, 33 have had fractures: z 29 per 100

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k population total time given a at cases * # Prevalence = Incidence*Duration Prevalence Prevalence measures the amount of disease existing in a population at a given time. What is the prevalence of people suffering from lack of sleep right now?
Prevalence = Incidence * Duration 2 same HIV last 10 yr How is prevalence related to incidence? Herpes last 5 yrs same 1/2

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Prevalence TIME SPECIFIED PER CONSTANT Pop Total Cases Num Total × Point prevalence —a “snap shot” of people with outcome of interest, among population at risk, at certain point in time; existing cases! Period prevalence —a combination of prevalent cases and incident cases over a certain time interval; existing and new cases!
Point Prevalence 0 1 2 3 4 5 6 7 Time (months) What is the point prevalence at the given time? A What is the size of the population at that time? How many prevalent cases are there? 5 1 C 5 2

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Period Prevalence 0 1 2 4 6 7 Time (months) A B What is the period prevalence between times A and B? How many cases are there during the time interval from A to B?
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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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Review for Midterm #1: Additional Slides - REMINDERS 1...

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