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Table 4 Reconstructing the 2 × 2 table.

From: Calculating unreported confidence intervals for paired data

  b c
Risk difference
Risk ratio
Odds ratio*
Odds ratio
  1. Determine the values of b and c first. Second, for all effect measures, and a = n -(d + b + c).
  2. s 0 or s is estimate of standard error calculated from the p-value.
  3. *Estimate and both proportions known.
  4. Estimate , one proportion , and p-value known.