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Amy's Step 1 Review > Biostat > Flashcards

Flashcards in Biostat Deck (16):
1

Sensitivity Eqn

Sensitivity = TP / (TP + FN)

2

Specificity Eqn

Specificity = TN / (TN + FP)

3

Positive Predictive Value Eqn

PPV = TP / (TP + FP)

4

Negative predictive value Eqn

NPV = TN / (FN + TN)

5

Odds Ratio Eqn

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6

Relative risk Eqn

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7

Attributable risk Eqn

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9

Absolute risk reduction Eqn

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12

Relative risk reduction Eqn

RRR = 1 − RR

14

Number needed to treat Eqn

NNT = 1/ARR

15

Number needed to harm Eqn

NNH = 1/AR

16

Prevalence affects which parameters?

PPV and NPV (inc prevalence = inc PPV)

17

Case-Control Study gives what ratio?

Odds Ratio

18

Cohort Study gives what ratio?

Risk Ratio

19

Case-Control Study

  • Compares ppl w/disease to ppl w/o disease
  • Looks for risk factors
  • Retrospective
  • Gives odds ratio

20

Cohort Study

  • Compares ppl w/exposure to ppl w/o exposure
  • Looks for outcome (i.e. disease)
  • Retro- or prospective
  • Gives Risk Ratio