Mean vocabulary scores plotted as a function of the two key variables, age of enrollment and family involvement ratings. The area above the horizontal dashed line represents the lower end of the average range for normal hearing students (average range is 100 ± 15). The rating 4 to 5 (filled circle) represents the highest levels of family involvement; 3 (filled triangle) represents average family involvement; 1 to 2 (open square) represents below average family involvement.
Means and 95% confidence intervals of verbal reasoning results for the most abstract level of questioning, grouped by age of enrollment. The dashed lines signify the scores representing the 25th and 50th percentile scores for normal hearing children.
Zero-Order Correlations Between Background Variables and Verbal Reasoning
*P < .01.
† Age enrolled was the age at which children began in the early intervention program. Children typically entered the program shortly after amplification was fit or were in the process of amplification fitting at the time of enrollment.