Module 7 : CHI Square Flashcards
1
Q
what does CHI square assess
A
- quality of work
- reliability
- quality assurance
2
Q
what is vascular statistical correlation
A
- non invasive tests compared to a GOLD STANDARD
+ validates accuracy and confidence of test
3
Q
gold standard venous test
A
- peripheral venous exam
+ venogram - carotid eval
+ angiogram
4
Q
how often do the non invasive test match the gold standard
A
- 90% of time
5
Q
factors limiting test accuracy
A
- sonographer skill \+ training and experience - physician skill \+ interpretation and experience - physical limitations of patient -
6
Q
five parameters that measure confidence of test
A
- sensitivity
- specificity
- positive predictive value
- negative predictive value
- accuracy
7
Q
sensitivity
A
- ability to DETECT DISEASE
- # of true positives / # of total positives by GS
8
Q
specificity
A
- ability of test to IDENTIFY NORMAL
- # of true negative tests / # of total negatives by GS
9
Q
positive predictive value (PPV)
A
- percentage of non invasive test results that ACCURATELY PREDICT ABNORMALITY
- # of true positive test / # of total positives
10
Q
negative predictive value (NPV)
A
- percentage of test results that ACCURATELY PREDICT NORMALITY
- # of true negative tests / # of total negatives
11
Q
accuracy
A
- percentage of CORRECT NON INVASIVE TESTS
- # of total correct results / # if total studies
12
Q
false positives
A
- patients that have a positive test (non invasive) but do not actually have the condition
+ gold standard said no disease
13
Q
false negative
A
- patients that have a negative test (non invasive) but do actually have the disease
+ gold standard said yes disease
14
Q
standard deviation
A
- looks at spread of Datta around any mean or average
15
Q
prevelance
A
- number of all cases in a population at one point in time expressed as ratio of pop size
- true positives + false positives / total number of cases
16
Q
incidence
A
- rate of occurrence of new cases in a population in a defined period
17
Q
sensitivity equation
A
TP / TP + FN
18
Q
specificity equation
A
TN / TN + FP
19
Q
PPV
A
TP / TP + FP
20
Q
NPV
A
TN / TN + FN
21
Q
accuracy
A
TN + TP / TN + TP + FP + FN
