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Group exercise lecture 8

Group exercise lecture 8. For the previous table. What is the probability a patient with HIV has HBV infection (answer using probability notation)? What is the probability a patient without HIV has HBV infection (answer using probability notation)?

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Group exercise lecture 8

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  1. Group exercise lecture 8

  2. For the previous table • What is the probability a patient with HIV has HBV infection (answer using probability notation)? • What is the probability a patient without HIV has HBV infection (answer using probability notation)? • What is the probability a patient has both HIV and HBV? (answer using probability notation)? • Are HIV and HBV independent: hint, use the addition rule

  3. In a hypothetical community, 50% of all people smoke and 40% are overweight. The percentage of people who are both overweight and smoke is 30% • What % of people smoke, are overweight or have both conditions (construct a 2 x 2 table) • Use your calculations for the above Q and verify the addition rule of probabilities: P(A or B) = P(A)+P(B) - P(A and B) • You sample at random a person from this community and find that he or she smokes. What is the probaility that he or she is oveweight? • Are smoking and overweight independent?

  4. Overweight Not overweight Total Smoker 0.3 0.2 0.5 Non-smoker 0.1 0.4 0.5 Total 0.4 0.6 1

  5. A 53 year old man comes in for an influenza vaccine but during the consultation he asks about his risk of a heart attack because of the recent death of a friend. You note from his records that his BP is 160/95 mmHg; he has no diabetes; he smokes 20 cigarettes a day and his total cholesterol is 5.2 mmol/l and his HDL is 0.9 mm/l. • Use the cardiovascular risk chart to calculate his 10 year risk of cardiovascular event. • What would his risk be if he was a non-smoker?

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