BioStats Flashcards

1
Q

Relative Risk Reduction (RRR)

A

(Risk in unexposed)-(Risk in exposed)/Risk in unexposed
ARR/Rate in the control

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2
Q

Number Needed to Harm (NNH)

A

1/Absolute Risk Increase (ARI)

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3
Q

Absolute Risk Increase (ARI)

A

ARI=Rate in treatment- Rate in the placebo

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4
Q

Normal Distribution

A

1 STD - 68%
2 STD - 95%
3 STD - 99.7%

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5
Q

Positive Likelihood Ratio

A

LR + = Sensitivity/(1-Specificity)

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6
Q

Negative Likelihood Ratio

A

LR - = (1-Sensitivity)/Specificity

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7
Q

Likelihood Ratio Interpretation

A

The higher the number, like 10, the more evidence to rule in disease
the lower the number, like <0.1, the more evidence to rule out disease

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8
Q

Absolute Risk Reduction (ARR)

A

ARR = Rate in control - Rate in the treatment

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9
Q

Relative Risk (RR)

A

Rate in the treatment/Rate in the control

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10
Q

Number Needed to Treat (NNT)

A

1/ARR

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11
Q

Attributable Risk Percentage (ARP)

A

ARP=Risk in exposed - Risk in control/Risk in exposed
(RR-1)/RR

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12
Q

Hazard Ratio

A

Rate disease/Rate in the control

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13
Q

False Positive Rate

A

1-specificity

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14
Q

False Negative Rate

A

1-Sensitivity

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15
Q

Odds Ratio

A

(A/C)/(B/D)
AD/BC

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16
Q

Positive Predictive Value

A

TP/(TP+FP)

17
Q

Negative Predictive Value

A

TN/(TN+FN)

18
Q

Negatively skewed Distribution

A

Mode>Median>Mean

19
Q

Positively Skewed Distribution

A

Mean>Median>Mode