Disease Detectives B/C

[Pickles]

1. What does R0 stand for? Define R0.
2. If a disease has an R0 of 3, what is the approximate percent of a population that needs to be vaccinated to obtain herd immunity?
3. If public health officials have estimated 80-90% of the population needs to be vaccinated in order to obtain herd immunity, what is the disease’s range of possible R0’s?
1. RO stands for reproduction number and it is the number of people infected from one infected person.
2. 66.6%
3. Possible RO’s: 5-10 [/quote]

All correct, your turn!
[/quote]

1. What does Relative Risk find compared to Odds Ratio?
2. When describing a test, what is the difference between Sensitivity and Specificity
3. Describe the levels of prevention (primary, secondary, tertiary)

[vye904]

1. What does Relative Risk find compared to Odds Ratio?
2. When describing a test, what is the difference between Sensitivity and Specificity
3. Describe the levels of prevention (primary, secondary, tertiary)

Click to Show Answer

1. Relative Risk measures the association between exposure and outcome using the risk of outcome in 2 groups while Odds Ratio measures the odds of the outcome in 2 groups.
2. Sensitivity: The chance of testing positive if you have the disease. Specificity: The chance of testing negative if you do not have the disease.
3. Primary: Reducing risk factors through whole populations, select groups, or healthy individuals. Secondary: Early detection during the asymptomatic stage. Tertiary: Treatment to stop the progression of the disease during the symptomatic stage.

[Pickles]

1. What does Relative Risk find compared to Odds Ratio?
2. When describing a test, what is the difference between Sensitivity and Specificity
3. Describe the levels of prevention (primary, secondary, tertiary)
[/quote]

Click to Show Answer

1. Relative Risk measures the association between exposure and outcome using the risk of outcome in 2 groups while Odds Ratio measures the odds of the outcome in 2 groups.
2. Sensitivity: The chance of testing positive if you have the disease. Specificity: The chance of testing negative if you do not have the disease.
3. Primary: Reducing risk factors through whole populations, select groups, or healthy individuals. Secondary: Early detection during the asymptomatic stage. Tertiary: Treatment to stop the progression of the disease during the symptomatic stage.

[/quote]

For number 1, you got it correct, but it wasn’t the answer I was looking for.

I was looking for
Relative Risk is the ratio of the probability of an event occurring in the exposed group versus the probability of the event occurring in the non-exposed group.

And

Odds ratio quantifies the strength of the association between two events.

You got questions 2 and 3 correct

[gz839918]

1. What does Relative Risk find compared to Odds Ratio?
2. When describing a test, what is the difference between Sensitivity and Specificity
3. Describe the levels of prevention (primary, secondary, tertiary)
[/quote]

Click to Show Answer

1. Relative Risk measures the association between exposure and outcome using the risk of outcome in 2 groups while Odds Ratio measures the odds of the outcome in 2 groups.
2. Sensitivity: The chance of testing positive if you have the disease. Specificity: The chance of testing negative if you do not have the disease.
3. Primary: Reducing risk factors through whole populations, select groups, or healthy individuals. Secondary: Early detection during the asymptomatic stage. Tertiary: Treatment to stop the progression of the disease during the symptomatic stage.

[/quote]

For number 1, you got it correct, but it wasn’t the answer I was looking for.

I was looking for
Relative Risk is the ratio of the probability of an event occurring in the exposed group versus the probability of the event occurring in the non-exposed group.

And

Odds ratio quantifies the strength of the association between two events.

You got questions 2 and 3 correct

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