### Description

The relative risk for improvement compares the percentage of those treated who improved against the percentage of those not treated who improved. A similar risk could be calculated for complications.

Parameters:

(1) number of patients who received a placebo (untreated)

(2) number of patients who were treated

(3) number of patients who received a placebo who improved

(4) number of patients who were treated who improved

percent of patients who received a placebeo or untreated who improved =

= (number of untreated who improved) / (total number untreated) * 100%

percent of patients who rwere treated who improved =

= (number of those treated who improved) / (total number treated) * 100%

relative risk for improvement =

= (percent of those treated who improved) / (percent of those untreated who improved)

Interpretation:

• A score < 1 indicates that the therapy may make things worse.

• A score around 1 indicates that the therapy is ineffective.

• A score > 1 indicates that the therapy may be effective, with confidence increasing with the value.