Biostat Flashcards
1
Q
NNT
A
1/ARR (AAR = risk in control group - risk in study group)
2
Q
Attributable risk percentage (ARP)
A
=(1-RR)/RR
3
Q
Factorial
A
2+ interventions, 2+ variables
4
Q
Chance that pt really does not have a disease w/ negative test result
A
1-NPV
5
Q
What varies w/ prevalence?
A
NPV (dec w/ prev) and PPV (inc w/ prev)
6
Q
Susceptibility bias
A
Type of selection bias pts treatment arm depends on disease severity
7
Q
Categorical variables
A
chi square
8
Q
Quantitative/sequential variables
A
t-test
