Statistics

Card Set Information

Author:
Mat
ID:
83946
Filename:
Statistics
Updated:
2011-08-22 07:40:11
Tags:
GIM
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Description:
Stats
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  1. Formula for Sensitivity?
    • Proportion of diseased popylation with positive test results
    • TP/(TP + FN)
  2. Mnemonic for sensitivity and specificity
    • SNout
    • SPin
  3. Confidence intervals
    If the 95% confidence interval crosses zero for a treatment, then it is NOT significant.

    If a 95% confidence interval crosses 1 for a relative risk or odds ratio, then it is NOT significant
  4. Number Needed to Treat
    • 1/(absolute risk reduction)
    • 1/(rate in placebo group minus rate in treatment group)
  5. Number Needed to Harm
    • The number needed to harm (NNH) is the number of pts who get a drug or intervention for each patient harmed.
    • 1/(rate harmed in treatment group - rate in placebo group)
  6. Relative Risk
    divide the incidence with exposure by the incidence without exposure

    Incidence with exposure ÷ incidence without exposure
  7. Attributable Risk
    subtract incidence with exposure from incidence without exposure

    Incidence with exposure - Incidence without exposure
  8. Formula for Specificity?
    TN / TN + FP

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