Epidemiology Flashcards
1
Q
Sensitivity
A
a/(a+c) = TP/(TP+FN)
2
Q
Specificity
A
d/(b+d) = TN/(TN+FP)
3
Q
PPV
A
a/(a+b) = TP/(TP+FP)
4
Q
NPV
A
d/(c+d) = TN/(TN+FN)
5
Q
which statistical values are affected by prevalence?
A
PPV and NPV
6
Q
Positive Likelihood Ratio
A
sensitivity/1-specificity = TP/FP
7
Q
Negative Likelihood Ratio
A
1-sensitivity/specificity = FN/TN
8
Q
absolute risk
A
incidence
9
Q
attributable risk
A
incidence of risk exposed - incidence of risk unexposed
10
Q
Relative risk
A
Incidence in exposed / incidence unexposed (a ratio) = [a/(a+b)] / [c/(c+d)]
11
Q
Odds ratio
A
ad / bc
12
Q
Type 1 error
A
conclude there is a difference when in fact there is not
13
Q
Type 2 error
A
conclude there is no difference when in fact there is
14
Q
Power
A
Power = 1 - type 2 error
15
Q
Live attenuated vaccines (6)
A
MMR, sabin polio, yellow fever, nasal flu
