Confidence interval

From

A confidence interval for a relative risk is essentially a margin of error. It provides a lower and upper bounds for the relative risk estimate with a certain level of confidence.

For example, a relative risk and 95% confidence interval of RR=1.7 95%CI (0.6, 4.7) means that there is a 95 percent likelihood that the true relative risk lies between 0.6 and 4.7.