Pulsation Absent Pulsation Present Total (Positive Test) (Negative Test) High Intracranial Pressure (Condition Present) 43 43 Normal Intracranial Pressure (Condition Absent) 18 128 146 Total 61 128 189 Sources: B

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What is the negative predictive value npv ? Use this value in a sentence explaining to a person the meaning of his or his negative test.
CHECK YOUR UNDERSTANDING
High intracranial pressure
(inside the skull) typically is a
result of an injury to the head
and can be very dangerous.
A screening test for high
intracranial pressure was
proposed many years ago,
based on the data in the
following observations. This
simple and non-invasive test
involves observing the retinal
vein to see if it is pulsating.
Pulsation is normal and so would be considered a negative test result.
Pulsation Absent
(Positive Test)
Pulsation Present
Total
(Negative Test)
High Intracranial Pressure
(Condition Present)
43
43
Normal Intracranial Pressure
18
128
146
(Condition Absent)
Total
61
128
189
Sources: B. E. Levin, "The Clinical Significante of Spontaneous Pulsations of the Retinal Vein." Archives of Neurology
Vol. 35, 1978. pp. 37-40, www.cebm.netindex aspalor1042
US
Transcribed Image Text:CHECK YOUR UNDERSTANDING High intracranial pressure (inside the skull) typically is a result of an injury to the head and can be very dangerous. A screening test for high intracranial pressure was proposed many years ago, based on the data in the following observations. This simple and non-invasive test involves observing the retinal vein to see if it is pulsating. Pulsation is normal and so would be considered a negative test result. Pulsation Absent (Positive Test) Pulsation Present Total (Negative Test) High Intracranial Pressure (Condition Present) 43 43 Normal Intracranial Pressure 18 128 146 (Condition Absent) Total 61 128 189 Sources: B. E. Levin, "The Clinical Significante of Spontaneous Pulsations of the Retinal Vein." Archives of Neurology Vol. 35, 1978. pp. 37-40, www.cebm.netindex aspalor1042 US
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