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How Effective is Vasc-Alert?

Statistics from Vasc-Alert performance indicate an impressive level of accuracy at several levels. This page describes four basic measurements. The links below will take you to other ways of quantifying Vasc-Alert's effectiveness.


Vasc-Alert's "batting average" over three months
  
Receiver Operating Curve for Vasc-Alert


SENSITIVITY

74 % of the time, Vasc-Alert correctly identified a patient with an access problem that will occur within the next 6 months

Positive Predictive Value is the probability of disorder being present, if the test is positive.
(=True Positives/ All Patients Predicted to have a Disorder)
POSITIVE PREDICTIVE VALUE

84 % of the time, if Vasc-Alert said the patient was positive, the patient did have an access problem.

Positive Predictive Value is the probability of disorder being present, if the test is positive.
(=True Positives/ All Patients Found to have the Disorder)
SPECIFICITY

96 % of the time Vasc-Alert correctly identified patients that did not have access problems within the ensuing 6 months.

Specificity is the probability of correctly identifying a patient without the disorder out of all the patients without the disorder.
(=True Negatives/ All Patients without a Disorder)
NEGATIVE PREDICTIVE VALUE

92 % of the time, if Vasc-Alert said that the patient was negative, the patient did not have an access problem.

Negative Predictive Value is the probability of disorder being absent, if the test is negative.
(=True Negatives/ All Patients predicted NOT to have a Disorder)


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