. Typically, measurement of cardiovascular reactivity involves the use of an aut
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. Typically, measurement of cardiovascular reactivity involves the use of an automated blood-pressure monitor to examine the changes in blood pressure before and after a stimulating experience (such as playing a video game). For this purpose, blood-pressure measurements were made with the Vita-Stat blood-pressure machine both before and after playing a video game. Similar measurements were obtained using manual methods for measuring blood pressure. A person was classified as a "reactor" if his or her DBP increased by 10 mm Hg or more after playing the game and as a nonreactor otherwise. The results are given in the table below. DB P,manual DBP, automated =10 If the manual measurements are regarded as the "true" measure of reactivity, then (a) What is the sensitivity of automated DBP measurements? (b) What is the specificity of automated DBP measurements? (c) If the population tested is representative of the general population, then what are the PV+ and PV- using this test?Explanation / Answer
a) here from above table:
a) sensitivity = 80/(80+60) = 0.5714
b)speciificity =30/(20+30) =0.6000
c)PV+ = numebr of true positive status/number of total positive status =80/100=0.80
PV- =30/90 =0.3333
automated manual <10 >=10 Total <10 80 60 140 >=10 20 30 50 Total 100 90 190Related Questions
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