Question

pls answer all

5:12 .. LED < Back 465 practice 2-1.docx 17 imagine you are a physician discussing the results of a screening test with a patient. 1) If the test was positive how likely is it that he really has the disease? (How worried should he be? 2) If the test was negative how likely is it that he really does NOT have it? How reassured should he be? 1) What does 1) represent? a) Express this measure mathematically in term of type of test results. 2) What does 2) represent? a) Express this measure mathematically in term of type of test results. 3) Study the table below and answer the questions Testresults Present Absen Positive 932983 Negative 45 63650 a) What do we call the value 132? b) What do we call the value 63650? c) What is the sensitivity of the test used to detect signs of the disease / condition? d) What is the specificity of the test used to detect signs of the disease / condition? 4) [From Richard M Hoffman, Frank D Gilliland, et al: Dashboard Calendar To Do Notifications inbox

Answer 1

1) 1 represents that the test ran on the patient was positive and it is very likely that the patient has the disease

2) 2 represents that the test ran on the patient was negative and it is unlikely that the patient has the disease.

3) The value 132 is true positive

The value 63650 is true negative

Sensitivity - TP/ TP+ FN

False negative - 45

= 132/ (132+45)

= 0.7%

Specificity - TN /TN+FP

False positive -983

= 63650/(63650+983)

= 0.9%