Treatment/Outcome Relation Calculators

File Name
(Click the ".xls" file, hold mouse button, select "save as" to download)

Calculator Name

Function of Calculator

treatout.xls

 

Treatout tutorial

 

Web Calculator (CEBM)

Contingency table: outcome as an effect of treatment

You specify the data relating treatment to outcome, it calculates odds ratio, etc.

casecont.xls

Contingency table statistics appropriate for case/control designs.

You enter data from a case control study, it produces valid statistics for generalization.

besd.xls

Binary Effect Size Display (BESD)

You specify a contingency table showing an effect (treatment/outcome), it expresses the relation as correlation, etc.

NNT.xls

Number needed to treat

You specify the effect of a treatment (probability of bad outcome without the treatment and with the treatment), it produces the number of patients you would need to treat to prevent one bad outcome.

NNTcost.xls

Number Needed to Treat and Cost

You specify the effect of a treatment (relating the probability of bad outcome without the treatment and with the treatment), it produces the number of people you would need to treat to prevent one bad outcome. You specify the cost of treating one person. It says whether it is worth treating one person, and gives thresholds on NNT and Cost of Treating.

Odds-Rat.xls

Odds ratio: contingency between treatment or exposure and outcome

You specify the contingency table, it calculates odds ratio. Allows this to be done from various starting points.

ORexplor.xls

Odds Ratio explorer - from retrospective to prospective context

Demonstrates why it is appropriate to use the Odds Ratio derived from a case control study, in a prospective context, and why OR is a good "control variable" for a sensitivity analysis.

Yearates.xls

Yearly Rates.

Translates outcome rates for treated and nontreated conditions (or Odds Ratio) in a multiyear study into annual rates.