How JustAnswer Works:
  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.
Ask R.R. Jha Your Own Question
R.R. Jha
R.R. Jha, Tutor
Category: Homework
Satisfied Customers: 5471
Experience:  B.Tech
20870358
Type Your Homework Question Here...
R.R. Jha is online now
A new question is answered every 9 seconds

A. Consider each of the following scenarios and explain whether

This answer was rated:

A. Consider each of the following scenarios and explain whether the variable in question is a confounder:

A study of the relationship between exercise and heart attacks that is conducted among women who do not smoke. Explain whether gender is a confounder.

Explanation:


A case-control study of the relationship between liver cirrhosis and alcohol use. In this study, smoking is associated with drinking alcohol and is a risk factor for liver cirrhosis among both non-alcoholics and alcoholics. Explain whether smoking is a confounder.

Explanation:






B. Interpret the results of the following studies
An odds ratio of 1.2 (95% confidence interval: 0.8-1.5) is found for the association of low socioeconomic status and occurrence of obesity.

Interpretation:


A relative risk of 3.0 is reported for the association between consumption of red meat and the occurrence of colon cancer. The p-value of the association is 0.15.

Interpretation:

An odds ratio of 7 (95% confidence interval: 3.0 – 11.4) is found for the association of smoking and lung cancer.





The relationship between cigarette smoking and lung cancer was conducted in a case-control study with 700 cases and 425 controls. Using the results below, calculate the crude odds ratio and explain what the ratio means:

a. Heavy Smoking—Cases: 450; Controls: 200

crude odds ratio:
explanation:
b. Not Heavy Smoking—Cases: 250; Controls: 225

crude odds ratio:
explanation:



A case-control study looked at the association of alcohol use with the occurrence of coronary heart disease (CHD). There were 300 participants in the study (150 cases and 150 controls). Of the cases, 90 participants drank alcohol; of the controls, 60 participants drank alcohol.


a. Design the appropriate 2x2 table, calculate and interpret the appropriate measure of association.








b. You suspect that the association between alcohol use and CHD might be confounded by smoking. You collect the following data:


Women Men
Accident No Accident Accident No Accident
Driver’s Ed 10 50 60 120
No Driver’s Ed 40 50 40 80

Calculate the appropriate measure of association between alcohol use and CHD in both smokers and non-smokers. Discuss whether smoking was a confounder of the association. What is the relationship of alcohol use to CHD after controlling for confounding?

Measure of Association Calculation (Smokers):



Measure of Association Calculation (Non-Smokers):



Was smoking a confounder of the association?



Relationship of alcohol use to CHD after controlling for confounding:






A study was conducted in young adults to look at the association between taking a driver's education class and the risk of being in an automobile accident. 450 participants were included in the study, 150 cases who had been in an accident and 300 controls who had not. Of the 150 cases, 70 reported having taken a driver's education class. Of the 300 controls, 170 reported having taken a driver's education class.

Calculate and interpret the appropriate measure of association between driver's education and accidents.

Calculation:
Interpretation:



The question arose as to whether gender might be an effect modifier of this association. When gender was assessed, the data looked like the following:



Women Men
Accident No Accident Accident No Accident
Driver’s Ed 10 50 60 120
No Driver’s Ed 40 50 40 80

Perform the appropriate calculations to test for effect modification. Interpret your results.

Calculations:
Interpretation:
THIS ANSWER IS LOCKED!

You need to spend $3 to view this post. Add Funds to your account and buy credits.
R.R. Jha and 5 other Homework Specialists are ready to help you
Customer: replied 3 years ago.

Thank you again for your great work ;-)

Most welcome!
Customer: replied 3 years ago.
Thanks! I will be sure to do so!

Related Homework Questions