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calculations for 5 matched pairs,

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Question

you are to complete calculations for 5 matched pairs, not 10 individual cases and controls (HINT: approach these

calculations by using 5 matched pairs when creating your table and identifying your cases and controls).

Here is some additional guidance: Since they are matched pairs, the case would be the first “Yes” or “No” and the controls would be the second “Yes” or “No.” Therefore, the first pair would be Yes/No, the second pair would be No/No, etc. Isolating your pairs in this manner will help you create your 2 X 2 table and define your A, B, C and D

An epidemiologist found five cases of “big toe cancer” in the Yukon Territory. Because there were only a few cases, the epidemiologist decided to conduct a matched case-control study to determine whether shoe size larger than 9 is a risk factor for big toe cancer. Cases were individually matched to one control for daily activity, history of athlete’s foot, and history of ingrown toenails. The following data were gathered: 

Shoe size > 9

Pair Case Control 

  1     Yes      No 

  2      No       No 

  3      No      Yes 

  4     Yes     Yes 

  5      No      Yes

  1. Compute the proper measure of association.
  2. Interpret your results.
 
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Summary of the article “Nationalized Healthcare

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Question

Summary of the article “Nationalized Healthcare -Prescription or Problem? ( A debate)”.  I need help summarizing

this article

 
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The following are BMI scores measured in 12 patients

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Question

The following are BMI scores measured in 12 patients who are free of diabetes and participating in a study of risk

factors for obesity. BMI is measured as the ratio of weight in kilograms in height in meters squared. 25  27   31   33   26   28   38   41   24   32   35  40 

what is Q1?

what is Q2?

 
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The mean body mass index (BMI)

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Question

1. The mean body mass index (BMI) for boys age 12 is 23.6. An investigator wants to test if the

BMI is higher in 12-year-old boys living in New York City. How many boys are needed to ensure that a two-sided test of hypothesis has 80% power to detect a difference in BMI of 2 units? Assume that the standard deviation in BMI is 5.7.

=

Alpha = ________

Z1-α/2= ________

Z1-β = ________

ES = ________

n= ________

2. An investigator wants to estimate caffeine consumption in high school students. How many students would be required to estimate the proportion of students who consume coffee? Suppose we want the estimate to be within 5% of the true proportion with 95% confidence.

Alpha = ________

Z= ________

p= ________

E = ________

n= ________

3. A crossover trial is planned to evaluate the impact of an educational intervention program to reduce alcohol consumption in patients determined to be at risk for alcohol problems. The plan is to measure alcohol consumption (the number of drinks on a typical drinking day) before the intervention and then again after participants complete the educational intervention program. How many participants would be required to ensure that a 95% confidence interval for the mean difference in the number of drinks is within 2 drinks of the true mean difference? Assume that the standard deviation of the difference in the mean number of drinks is 6.7 drinks.

Z= ________

s= ________

E = ________

n= ________

 
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