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Unadjusted Risk Difference (RD) Calculator

By inputting the counts of events and totals for each group, this calculator quickly computes the risk difference along with its confidence interval, Z-score, and p-value.

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If you want to convert or calculate data for more than one study at the same time, enter data for study 1, study 2, study 3, ...etc, RESPECTIVELY across all cells using the same order.

Conversion Results

Study ID Event 1 Total 1 Event 2 Total 2 C Level RD CI Start CI End Z P-value
1 20 10 25 12 0.8 5 3 3 3 3

Description of the formula

Variables Definitions

  1. Confidence Interval (CI): This represents the confidence level expressed as a decimal value. For example, 0.95 corresponds to a 95% confidence interval.
  2. Number of Participants: The total number of individuals or data points in the sample or study.
  3. Upper CI Limit: The upper limit of the confidence interval.
  4. Lower CI Limit: The lower limit of the confidence interval.
  5. Standard Deviation (SD): The calculated standard deviation based on the provided confidence interval information.

Conversion Formula

  1. Calculation of the standard errors wide

functionally

View more - Cochrane Handbook - Cochrane Handbook