Fei, P. P., Kühn, H., Huestegge, L., Lee, I., Hagen, R., and Shehata-Dieler, W.
Objectives: The interdisciplinary follow-up program of hearing impaired children at the Comprehensive Hearing Center, Würzburg University Hospitals includes regular evaluation of children's general and cognitive development. Intelligence is evaluated at the intervals of the 24th and 48th month after first fitting. In this study, we investigate: 1. Cross-sectional comparison of cognitive/intelligence abilities between children with cochlear implantation (CI) and with hearing aids (HA). 2. Longitudinal evaluation of verbal and nonverbal (performance) Intelligence in CI children and HA children. Material and methods: 20 CI children and 23 HA children were evaluated at both intervals, using the Wechsler Preschool and Primary Scale of Intelligence Third Version (WPPSI-III) and Wechsler Intelligence Scale for Children Fourth Version (WISC-IV) depending on children's chronological age. The tests calculate different indexes (Intelligence quotients, IQ) for verbal comprehension, perceptual reasoning, working memory and processing speed. The two times' evaluation data were analyzed in the present study. Significant was set as p<0.05. Results: 1. Study population: Up to September 2019, there were 20 CI children and 23 HA children who had two time evaluations. The average chronological age (years) at the first and second test in years for CI Children was 5.61 (SD=1.48) and 8.26 (SD=1.80) and for HA Children was 5.45 (SD=1.85) and 7.63 (SD=1.89). The hearing age (years), effective usage of CI/HA, at first and second test: CI children were 2.22 (SD=1.53) and 4.86 (SD=1.58) and HA children were 1.28 (SD=1.15) and 3.51 (SD=1.19). There was no significant difference in children's age between two groups at both evaluation times. 2. Comparisons between CI and HA children at both intervals: At 24th months evaluation, there was no significant differences according to group means of (1) verbal IQ in CI children (mean=98.40, SD=13.79) and HA children (mean=100.45, SD=16.68), t=0.39, p=0.70; and (2) nonverbal IQ in CI children (mean=102.42, SD=16.11) and HA (mean=105.68, SD=16.89), t=0.61, p=0.55. The same outcome was observed at 48 months evaluation: (1) verbal IQ in CI children (mean=108.35, SD=23.00) and HA children (mean=110.18, SD=16.97), t=0.29, p=0.78; (2) nonverbal IQ CI (mean=108.95; SD=15.08) and HA children (mean=105.87, SD=17.76), t=0.61, p=0.55. 3. Longitudinal evaluation of cognitive development: Using repeated measurement analysis, in CI children, there was a significant difference in verbal IQ and non-verbal IQ between first and second evaluation (F(1,13)=23.13, p=0.00). Both sub-IQ at the second time was better than at first evaluation. There was a significant interaction effect between test time and components of intelligence (F=6.46, p=0.03). This indicated an accelerated positive development of CI children in verbal performances. In HA children there was no significant difference between two tests neither in verbal IQ nor in nonverbal IQ (F(1,17)=3.09, p=0.10). Also, there was no significant difference between verbal and nonverbal IQ in both tests (F(1,17)=0.00, p=0.97). Conclusions: 1. Cross-sectional comparison between CI and HA children: There is no significant difference in verbal and nonverbal IQ between CI and HA children neither in 24th months nor in the 48th months after intervention. 2. CI children's longitudinal intelligence performances, especially ability in verbal comprehension, continue accelerated after intervention. But this trend did not show in HA children. 3. In early evaluation, CI children's verbal IQ was significantly worse than nonverbal IQ but the difference disappeared over time. [ABSTRACT FROM AUTHOR]