$\text{95% confidence limits for a Risk Ratio}={e}^{\left(\mathrm{ln}\left(RR\right)±1.96\sqrt{\frac{1}{\text{a}}-\frac{1}{{N}_{1}}+\frac{1}{c}-\frac{1}{{N}_{0}}}\right)}$

Description:

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.