Epidemiology
Please answer the following:
1. A screening test for a newly discovered disease is being evaluated for its effectiveness. In order to determine the effectiveness of the new test, it was administered to 880 workers. Of those, 120 of the individuals diagnosed with the disease (through a more invasive test) screened positive for it. Results from the test showed a negative screen test for 50 people who also had the disease. A total of 40 people without the disease (found through a more invasive test) screened positive for the disease. Please show work.
Create a 2 x 2 table with all the appropriate values
2. Two different tests measure stress in an individual. The Stress Test Alpha Battery (STAB) and the Stress Test Beta Battery (STBB). The sensitivity and specificity of the two tests are as follows:
STAB:
Sensitivity 60%
Specificity 95%
STBB
Sensitivity 75%
Specificity 90%
What test had the greatest false negatives? Please show work.
Select one:
a. STAB
b. STBB
3. In a study of diabetics, 100 of the 189 diabetic mean died during the 13 year follow up period. What is the risk of death? Please show work.
Select one:
a. (100/189) x 100 = 52.9%
b. 100/189 = 0.52%
4. A screening test for a newly discovered disease is being evaluated. It was administered to 880 workers. Of those, 120 diagnosed with the disease were screened positive. Results from the test showed a negative test for 50 people who actually had the disease. A total of 40 people without the disease, screened positive for it.
What is the sensitivity of the test? Please show work.
Select one:
a. 120/170 = 0.705 = 70.5%
b. 120/880 = 0.136 = 13.63%
c. 670/880 = .761=76%
5. In a survey of 1,150 women who gave birth in Main in 2017, a total of 468 reported taking multivitamins at least 4 times a month during the month before becoming pregnant. Calculate the prevalence of frequent multi-vitamin use in this group. Please show work.
Select one:
a. (468/1150) x 100 = 40.6%
b. (1150-468) / 468 = 1.45%
c. 468/1150 = .406%
6. A screening test for a newly discovered disease is being evaluated. It was administered to 880 workers. Of those, 120 diagnosed with the disease were screened positive. Results from the test showed a negative test for 50 people who actually had the disease. A total of 40 people without the disease, screened positive for it.
What is the specificity of the test? Please show work.
Select one:
a. 670 / 710 = .94%
b. 120/880 = 1.36 = 13.6%
c. 120/880 = 1.36%
d. 670/710 = 0.943 = 94%
