Q.4- In 100 lung cancer patients, a new screening test finds 85 positive, what i
ID: 128237 • Letter: Q
Question
Q.4- In 100 lung cancer patients, a new screening test finds 85 positive, what is the sensitivity of the test? A. 0.5 B. 0.75 C. 0.85 D.1.85
5. A screening test that has a low Predictive Value (+) and a hi igh Predictive Value (-) is more efficient in identifying A. True positive B. True negative C. False positive D. False negative
6. A screening test that has a high sensitivity and a low specificity is more efficient in identifying A. True positive B. True negative C. False positive D. False negative
7. The risk of a non-communicable chronic disease is best estimated by its A. Prevalence rate B. Incidence rate C. Death rate D. Birth rate
8.Which of the following is NOT a longitudinal study? A. Cohort study B. Case-control study C. Cross-sectional study D. Ecological study duuring a school-ba
9. A bias in measurement that occurs during a school-based survey when the absent students did not respond to the survey is A.Hawthrone effect B. Healthy worker effect C.Ecological fallacy D.Random error Which screening test has higher sensitivity? A. Test A B. Test B C. Their sensitivities are the same D. No sufficient information to conclude were tested positive by the screening test A and 5 were Use the following data to answer the questions #18 to 20: Among 100 diagnosed patients, 90 were tested positive by the screening test A and 80 were tested positive by the screening test B. Among 400 confirmed healthy people, 10 G. tested positive by the screening test B.
Explanation / Answer
Diseased group n =100
Healthy group n = 400
(a) ( b)
90 10
(a) (b)
80 20
(c) (d)
10 390
(c) (d)
5 395
1. Test A - 90 patients were tested positive by test A among diagnosed patients compared to test B. and 10 patients where screened positive from healthy people compared to test B.
2. Test A - Test A has screened more people for both diagnosed and healthy people
3. Test B-
Test A = a/a+c = 90 /90+10 = 0.9
Test B = a/a+c = 80/ 80+5 = 0.9411
so Test B is having higher predictive value
4. 0.85%
equation for Sensitivity = TP/TP +FN ( TRUE POSITIVE / TRUE POSITIVE + FALSE NEGATIVE ) here true positive is 85
= 85/ 85+15
= 0.85%
7. Prevalence rate- Prevalence rate indicates the particular disease or condition in a given population at a specific period. Since the disease is non-communicable chronic disease finding the prevalence rate is specific to understand the statistic of the disease
8. Cross-sectional study ( cross-sectional study do comparison at one period of time whereas longitudinal studies are studied and restudied over a period of time)
9. Random error - all the other effects mentioned is pointing towards the environmental factors of the subjects. whereas the random error is the "measurement error" happened during sample collection.
TEST A TEST B(a) ( b)
90 10
(a) (b)
80 20
(c) (d)
10 390
(c) (d)
5 395
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