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Population Health Assessment

Population Health Assessment. The Use of 2 by 2 Tables. Health Assessment. Healthy. UnHealthy. Healthy. UH. HOW TO SEPARATE THE TWO SUBPOPULATIONS?. Health Assessment. SURVEYS. SURVEILLANCE. ON-GOING EPIDEMIOLOGIC INTELLIGENCE. GATHERING. USUALLY LONG TERM. SYSTEMATIC and ORGANIZED.

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Population Health Assessment

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  1. Population Health Assessment The Use of 2 by 2 Tables

  2. Health Assessment Healthy UnHealthy Healthy UH HOW TO SEPARATE THE TWO SUBPOPULATIONS?

  3. Health Assessment SURVEYS SURVEILLANCE ON-GOING EPIDEMIOLOGIC INTELLIGENCE GATHERING USUALLY LONG TERM SYSTEMATIC and ORGANIZED

  4. Health Assessment HEALTHY H Unhealthy UH POPULATION SAMPLE

  5. SAMPLING MUST BE: 1. UNBIASED 2. REPRESENTATIVE THIS WILL BE THE ONLY WAY TO MAKE INFERENCES

  6. SAMPLING NON RANDOM.....CONVENIENCE RANDOM 1. SIMPLE RANDOM 2. STRATIFIED RANDOM 3. STAGE BY STAGE RANDOM 4. SYSTEMATIC RANDOM

  7. SAMPLING Need to Have the Knowledge Base and Skills in: #1: SAMPLING PROCEDURE NON RANDOM.....CONVENIENCE RANDOM #2: SAMPLE SIZE Determination WITH THESE TWO CONSIDERATIONS...ONE CAN PROCEED TO ASSESS THE HEALTH OF A POPULATION UNDER STUDY

  8. Health Assessment Healthy UnHealthy Healthy UH HOW TO SEPARATE THE TWO SUBPOPULATIONS? The Use of TEST SYSTEMS

  9. Health Assessment TEST SYSTEMS CLINICAL IMMUNO-DIAGNOSTIC PHYSIO-CHEMICAL OTHERS ONE COMMON CHARACTERISTICS OF TEST SYSTEMS ? FALLACIES AND INACCURACIES

  10. TEST SYSTEMS FALLACIES AND INACCURACIES TEST POSITIVES TEST NEGATIVES WHAT DOES IT MEAN ? COULD MEAN ?

  11. TEST SYSTEMS FALLACIES AND INACCURACIES TEST POSITIVES TEST NEGATIVES WHAT DOES IT MEAN ? COULD MEAN ? HOW TO ASSESS OR ESTIMATE INACCURACIES.....

  12. TEST SYSTEMS TEST SENSITIVITY AND TEST SPECIFICITY AND OTHER MEASURES Se PREDICTIVE VALUES (+ or -) Sp DIAGNOSABILITY F+ F-

  13. TEST SYSTEMS TOTALS Test Positives + TEST SYSTEM - Test Negatives Refer to Exercise

  14. The 2 By 2 Table: How to Create it?? How to Create a 2 By 2 Table??? Why do we need it? Where do we Get the data to insert in these Tables??

  15. TEST SYSTEMS STATE OF NATURE D+ D- SUB-TOTALS + TEST SYSTEM - SUB-TOTALS Note: How to Cross Classify to Create the 2 By 2 Table.

  16. TEST SYSTEMS STATE OF NATURE D+ D- SUB-TOTALS + TEST a b a+b SYSTEM - c d c+d b+d a+c n=a+b+c+d SUB-TOTALS Note: How to Cross Classify to Create the 2 By 2 Table

  17. TEST SYSTEMS STATE OF NATURE (Gold Standard) D+ D- SUB-TOTALS + TEST a b a+b SYSTEM - c d c+d b+d a+c n=a+b+c+d SUB-TOTALS Se= P(T+/D+)= a/(a+c) Sp= P(T-/D-)= d/(b+d)

  18. TEST SYSTEMS STATE OF NATURE (Gold Standard) D+ D- SUB-TOTALS + TEST a b a+b SYSTEM - c d c+d b+d a+c n=a+b+c+d SUB-TOTALS Se= P(T+/D+)= a/(a+c) Sp= P(T-/D-)= d/(b+d) F+= P(T+/D-)= b/(b+d) F-=P(T-/D+)=c/(a+c)

  19. TEST SYSTEMS STATE OF NATURE (Gold Standard) D+ D- SUB-TOTALS + TEST a b a+b SYSTEM - c d c+d b+d a+c n=a+b+c+d SUB-TOTALS Predictive value(+)=a/(a+b) True Prevalence=(a+c)/n Apparent Prevalence=(a+b)/n Predictive value(-)=d/(c+d)

  20. TEST SYSTEMS LINK STATE OF NATURE D+ D- SUB-TOTALS + TEST a b a+b SYSTEM - c d c+d b+d a+c n=a+b+c+d SUB-TOTALS DIAGNOSABILITY= P(D+/T+)= (P(D+)*P(T+/D+))/(P(D+)*P(T+/D+))+((P(D-)*P(T+/D-))

  21. EXERCISE: CASE PROBLEM #1

  22. EXERCISE: CASE PROBLEM #1

  23. EXERCISE: CASE PROBLEM #1

  24. EXERCISE: CASE PROBLEM #1

  25. EXERCISE: CASE PROBLEM #1

  26. EXERCISE: CASE PROBLEM #1Note How Data in the Table is Presented

  27. EXERCISE: CASE PROBLEM #1Note How Data in the Table is Presented

  28. Bonus Question Discuss Diagnosability as a Decision Making Exercise

  29. Good Luck Refer to Online Epidemiology Course @: http://www.onemedicine.tuskegee.edu

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