Statistics Flashcards
1
Q
accuracy
A
(TP + TN)/ Total percentage of times that both tests match up perfectly for the level of disease evaluated
2
Q
sensitivity
A
TP/ (TP+FN)
ability to detect disease when actually present lower velocity threshold
3
Q
specificity
A
TN/ TN+FP
higher specificity
less people with disease
higher velocity threshold
4
Q
positive predictive value
A
TP / (TP + FP)
how good is the test at predicting a positive result
5
Q
negative predictive value
A
TN / (TN + FN)
how good test is at predicting negative result
6
Q
prevalence
A
TP + FN/ Total
how prevalent is the disease in the population studied
incidence of disease in the total population
7
Q
higher velocity threshold
A
higher specificity
8
Q
lower velocity threshold
A
higher sensitivity
9
Q
area reduction not used in US or angio 50% diameter
A
75% area reduction
