The table below presents the results of the test.  1) the researchers decide to use a 70-ms cutoff and obtain following tmredults: TP = 17, FP = 15, FN = 24, TN = 44. calculate the following values: a) sensitivity  b) specificity  c) PV (+)  d) PV (-) 2) how did changing the cut-point affect the accuracy of the test?

MATLAB: An Introduction with Applications
6th Edition
ISBN:9781119256830
Author:Amos Gilat
Publisher:Amos Gilat
Chapter1: Starting With Matlab
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The table below presents the results of the test. 

1) the researchers decide to use a 70-ms cutoff and obtain following tmredults: TP = 17, FP = 15, FN = 24, TN = 44.

calculate the following values:

a) sensitivity 

b) specificity 

c) PV (+) 

d) PV (-)

2) how did changing the cut-point affect the accuracy of the test?

Chapter 12 Clinical Epidemiology Questions
21. Muscle tension dysphonia (MTD) can masquerade as adductor spasmodic dysphonia (ADSD), leading to
diagnostic confusion. ADSD is a neurogenic, action-induced, focal laryngeal dystonia wherein the speaker
experiences involuntary hyper-adduction of the true vocal folds, producing debilitating voice breaks and an
of phonatory breaks as a possible objective test to distinguish ADSD from MTD using the 40-ms cutoff. The
effortful, strained-strangled voice quality. An investigation assessed the diagnostic worth of acoustic analysis
table below presents the results of the test.
ADSD versus MTD using a 40-ms cutoff
Test Outcome
Positive
Test (i.e.,
Phonatory
Break at
≥ 40 ms)
Negative
Test (i.e.,
Phonatory
Break at
< 40 ms)
Reference Standard
"Has ADSD"
(n = 27) 15
True positives
(n = 14)
False negatives
"Has MTD"
(n = 25)
False positives
(n = 34)
True negatives
insvang visming 16 yriW .81
3036 2000sini sot narit
To 25% wol od ednozod et
ozda
Transcribed Image Text:Chapter 12 Clinical Epidemiology Questions 21. Muscle tension dysphonia (MTD) can masquerade as adductor spasmodic dysphonia (ADSD), leading to diagnostic confusion. ADSD is a neurogenic, action-induced, focal laryngeal dystonia wherein the speaker experiences involuntary hyper-adduction of the true vocal folds, producing debilitating voice breaks and an of phonatory breaks as a possible objective test to distinguish ADSD from MTD using the 40-ms cutoff. The effortful, strained-strangled voice quality. An investigation assessed the diagnostic worth of acoustic analysis table below presents the results of the test. ADSD versus MTD using a 40-ms cutoff Test Outcome Positive Test (i.e., Phonatory Break at ≥ 40 ms) Negative Test (i.e., Phonatory Break at < 40 ms) Reference Standard "Has ADSD" (n = 27) 15 True positives (n = 14) False negatives "Has MTD" (n = 25) False positives (n = 34) True negatives insvang visming 16 yriW .81 3036 2000sini sot narit To 25% wol od ednozod et ozda
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