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Interaction effect of age of implantation on WRS(CI) as a function of years of deafness. The three lines show the estimated linear relationship between age of implantation on WRS(CI) when years of deafness is set to the 34th, 50th, and 68th percentile (i.e., one standard deviation (SD) below the mean, the mean, and one SD above the mean). The shaded intervals around the lines indicate the 95% confidence interval derived from the coefficient estimates in the linear model.
