Model estimates of the mean and 95% confidence limits for probability of death in each treatment and for the effect of exposure.

The effect of exposure was defined as 100% • (pe−pc)/(1−pc), in which pe is the estimated mean probability of death in the exposure group and pc is the estimated mean probability of death in the control group. The labels of the sound exposure treatments refer to the distance from the pile, the associated sound levels are presented in Table 3.