95% confidence limits for a Risk Ratio=e(ln(RR)±1.961a1N1+1c1N0)


Math equation. The 95% confidence limits for a risk ratio equal the constant "e" raised to the power of the natural log of the risk ratio plus or minus 1.96 times the square root of the following sum: 1 over a minus 1 over N sub 1 plus 1 over c minue 1 over N sub zero. The four items in the sum are defined in the next sentence after the equation.