Statistics

Question 1

Sensitivity formula

Answer 1

Sn = TP / (TP + FN)

Question 2

Specificity formula

Answer 2

Sp = TN / (FP + TN)

Question 3

Positive Predictive Value Formula

Answer 3

PPV = TP / (TP + FP)

Question 4

Negative Predictive Value Formula

Answer 4

NPV = TN / (TN + FN)

Question 5

What statistical values increase as prevalence increases?

Answer 5

PPV and NPV

Question 6

Prevalence formula

Answer 6

Prev = (TP + FN) / (TP + FP + TN + FN)

Question 7

Positive Likelihood Ratio formula

Answer 7

LR+ = Sn / (1 - Sp)

Question 8

Negative Likelihood Ratio formula

Answer 8

LR- = (1 - Sn) / Sp

Question 9

Absolute risk formula

Answer 9

ARR = EER/Total in experimental group

EER = Experimental event rate

Question 10

Relative Risk Formula

Answer 10

RR = EER/ CER

EER = Experimental event rate
CER = control event rate

Question 11

Absolute risk reduction formula

Answer 11

ARR = | ERR - CER |

Question 12

Relative Risk Reduction formula

Answer 12

RRR = ARR/CER

Question 13

Number needed to treat formula

Answer 13

NNT = 1 / ARR

Question 14

Number needed to harm formula

Answer 14

NNH = 1 / ARI

Question 15

Absolute Risk Increase formula

Answer 15

ARI = (AR for experimental group) - (AR for control group)