2.5 Statistical analysis
Statistical analyses were performed using the SPSS software (version 22, SPSS Inc. Chicago, USA).All data showed normal distribution.ANOVA test was used to compare MAIS scores, pattern perception scores, sentence recognition scores, and language performance scores between the groups. Continuous variables (i.e., chronological age, CI age, and duration of CI use) were reported as means, standard deviations, and ranges by post-hoc t-test. The differences among mean with p -value < .005 accepted as representing statistically significant differences.