In a case-control study, unadjusted odds of previous transplant among sepsis cases was 2.2 times that...
In a case-control study, unadjusted odds of previous transplant among sepsis cases was 2.2 times that of controls. After adjusting for gender, the odds ratio was 3.1. This suggests:
- Gender was not a confounder
- Gender was a positive confounder
- Gender was a negative confounder
Homework Answers
Since the odds ratio was 2.2 and after adjusting it was 3.1, this implies
Gender is a positive confounder
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In a case-control study, unadjusted odds of previous transplant
among sepsis cases was 2.2 times that...
. In a hypothetical case-control study of 180 cases of heart disease and 300 unmatched controls,...
. In a hypothetical case-control study of 180 cases of heart disease and 300 unmatched controls, the following 2x2 table was determined for the association of sedentary lifestyle with heart disease: Cases Controls Sedentary lifestyle 135 150 Not sedentary lifestyle 45 150 180 300 (a) Compute the odds ratio for sedentary lifestyle and heart disease. (b) There is concern that sex may be a confounder in the relationship between sedentary lifestyle and heart disease. What three conditions must...
Read the following research study and answer the following questions: A case control study was conducted...
Read the following research study and answer the following questions: A case control study was conducted to evaluate the relationship between direct sun exposure and skin cancer. 150 Cases and 100 controls were recruited from Al Wehda hospital. A data collecting method was distributed among both controls and cases. Analysis of data revealed that 70 of cases were exposed to active smoking while only 40 of controls were exposed. Construct a 2 by 2 table to demonstrate the two dichotomous...
Read the following research study and answer the following questions: A case control study was conducted...
Read the following research study and answer the following questions: A case control study was conducted to evaluate the relationship between direct sun exposure and skin cancer. 150 Cases and 100 controls were recruited from Al Wehda hospital. A data collecting method was distributed among both controls and cases. Analysis of data revealed that 70 of cases were exposed to active smoking while only 40 of controls were exposed. Construct a 2 by 2 table to demonstrate the two dichotomous...
In a case control study published in 2013 risk factors for stroke in a population in...
In a case control study published in 2013 risk factors for stroke in a population in rural Tanzania were assessed. Of particular interest was HIV status. A total of 200 stroke cases from 2 districts were identified at hospitals and 398 controls, randomly selected from the background census population, frequency matched for age (+/- 3 years) and sex. A total of 26 cases were HIV positive compared to 16 controls. Q1 Complete the “2 by 2” table (including headers) below...
Question 5 A recent case-control study compared the consumption of vitamins among those who infected with...
Question 5 A recent case-control study compared the consumption of vitamins among those who infected with season influenza (cases) and those not affected by seasonal influenza (controls). The calculated odds ratios was. 0.61. The 95% confidence interval was 0.49-0.73. The most accurate interpretation of this result is: People who consume vitamins are 0.61 times more likely to contract seasonal influenza than those who do not consume vitamin. People who consume vitamins are 39% less likely to contract seasonal influenza than...
Suppose you conduct a case-control study of endometrial cancer, with 200 cases and 200 unmatched controls....
Suppose you conduct a case-control study of endometrial cancer, with 200 cases and 200 unmatched controls. According to medical records (which we will assume are correct), 150 of the cases and 100 of the controls have used postmenopausal estrogens. (a) Construct the appropriate 2x2 table, and compute and interpret the odds ratio for endometrial cancer associated with postmenopausal estrogen use.
To study the causes of an outbreak of aflatoxin poisoning in Africa, investigators conducted a case-control study with 4...
To study the causes of an outbreak of aflatoxin poisoning in Africa, investigators conducted a case-control study with 40 case-patients and 80 controls. Among the 40 poisoning victims, 32 reported storing their maize inside rather than outside. Among the 80 controls, 20 stored their maize inside. a. Set up a 2 x 2 table and calculate the odds ratio for the association between inside storage of maize and illness. b. Interpret the odds ratio.
Question 28 0 out of 2 po n a case-control study of osteoporosis, 150 women were...
Question 28 0 out of 2 po n a case-control study of osteoporosis, 150 women were enrolled as cases and an equal number as controls. Among the cases 50 reported low calcium intake, while only 20 of the controls reported low calcium intake. Calculate the odds ratio in the association between low calcium intake and developing osteoporosis in this population.
Question 22 0 out c In women with deep venous thrombosis (DVT), a case-control study was...
Question 22 0 out c In women with deep venous thrombosis (DVT), a case-control study was conducted to test the association between DVT and past exposure to oral contraceptive (OC) use. Based on the data below, what is the unadjusted odds exposure to OC use among the cases of women with DVT compared to that among the controls without DVT? Oral Yes No Total 67 108 23 152 175 175
A case-control study was designed to see if body piercing by unlicensed merchants was associated with...
A case-control study was designed to see if body piercing by unlicensed merchants was associated with an increased risk of hepatitis B compared to those receiving piercing from licensed merchants. Cases with clinically diagnosed hepatitis B were pair matched to controls without hepatitis B by age, sex, and number of previous body piercings. The results of the study appear in the table below. Based on the information, calculate the matched odds ratio, Controls Exposed Unexposed Cases 96 23 Exposed 87...
Read the following research study and answer the following questions: A case control study was conducted to evaluate the relationship between direct sun exposure and skin cancer. 150 Cases and 100 controls were recruited from Al Wehda hospital. A data collecting method was distributed among both controls and cases. Analysis of data revealed that 70 of cases were exposed to active smoking while only 40 of controls were exposed. Construct a 2 by 2 table to demonstrate the two dichotomous...
Read the following research study and answer the following questions: A case control study was conducted to evaluate the relationship between direct sun exposure and skin cancer. 150 Cases and 100 controls were recruited from Al Wehda hospital. A data collecting method was distributed among both controls and cases. Analysis of data revealed that 70 of cases were exposed to active smoking while only 40 of controls were exposed. Construct a 2 by 2 table to demonstrate the two dichotomous...
Question 28 0 out of 2 po n a case-control study of osteoporosis, 150 women were enrolled as cases and an equal number as controls. Among the cases 50 reported low calcium intake, while only 20 of the controls reported low calcium intake. Calculate the odds ratio in the association between low calcium intake and developing osteoporosis in this population.
Question 22 0 out c In women with deep venous thrombosis (DVT), a case-control study was conducted to test the association between DVT and past exposure to oral contraceptive (OC) use. Based on the data below, what is the unadjusted odds exposure to OC use among the cases of women with DVT compared to that among the controls without DVT? Oral Yes No Total 67 108 23 152 175 175
A case-control study was designed to see if body piercing by unlicensed merchants was associated with an increased risk of hepatitis B compared to those receiving piercing from licensed merchants. Cases with clinically diagnosed hepatitis B were pair matched to controls without hepatitis B by age, sex, and number of previous body piercings. The results of the study appear in the table below. Based on the information, calculate the matched odds ratio, Controls Exposed Unexposed Cases 96 23 Exposed 87...
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