1. What would be the absolute risk reduction if the incidence of a GI bleed was 2% for a treatment group and 7% for a control group? a) 15%. b) 2%. c) 5%. d) 9%
2. If the calculated absolute risk reduction for a pulmonary embolism is 7.2%, what would be the number needed to treat? a) 13.9. b.) 17.3. c) 1.2. d) 0.2.
3. Which of the following is TRUE about odds ratio? a) if the OR is less than 1, the exposure is more likely to cause an adverse event. b) If an OR= 1, there is no relationship between an exposure and an event. c) if an OR=1, there is a true relationship between an exposure and an event. d) If the OR is greater than 1, the exposure is less likely to cause an adverse event.
4. What does the following statement mean: RRR= 18% 95% [0.14-p.22] p is less than 0.05. a) all the above. b) 95% confidence that the true value lies between 14% and 22%. c) Less than 5% chance that the results are due to random chance. d) The relative risk of an adverse event in the treatment group is 18% less than in the control group.
5. Which of the following is TRUE regarding likelihood rations? a) A negative likelihood ratio means that a test is worthless. b) A likelihood ratio must be greater than 10 to be considered valuable. c) Likelihood rations are less likely to change with teh prevalence of a disorder. d) Positive predictive value is the same as positive likelihood ratio
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