Primary Author:
Title:
Journal:
Publication Year:
Outcome:
Outcome Type:	Undesirable  Desirable
Source:
Duration:	Years Weeks Days
Control:
Intervention:
Number in Control Group:
Number in Intervention Group:
Data:	Number of Events Event Rate
Number of Events in Control:
Number of Events in Intervention:
Control Event Rate:	%
Intervention Event Rate:	%

Event Rate				Relative Risk			Number Needed to Treat
Ctrl	Intn	RRR	ARR	RR	-95% CI	+95% CI	NNT	-95% CI	+95% CI

• For this outcome the intervention shows benefit.
• ARI = absolute risk increase, RRI = relative risk increase, RR = relative risk.

• For this outcome the intervention shows harm.
• ARR = absolute risk reduction, RRR = relative risk reduction, RR = relative risk.

• For this outcome the intervention shows harm.
• ARI = absolute risk increase, RRI = relative risk increase, RR = relative risk.

• For this outcome the intervention shows benefit.
• ARR = absolute risk reduction, RRR = relative risk reduction, RR = relative risk.

A chi-square test indicates this result is not statistically significant at a P-value of <0.05.

If the original publication from which you got your data reported a statistically significant result, first check your data entry. If you have entered your data correctly, the differing results of significance may be because the original publication used another statistical test.

If the result in the original publication was statistically significant, the NNT or NNH provided by the calculator is a reasonable estimate. However, the 95% confidence intervals may not be accurate and are not presented.

If the original publication did not report statistical significance you should NOT present the NNT or NNH provided by the calculator.