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Abstract
Objective: This study investigated the factors influencing 5-year language, speech and everyday functioning of children with congenital hearing loss. Design: Standardised tests including PLS-4, PPVT-4 and DEAP were directly administered to children. Parent reports on language (CDI) and everyday functioning (PEACH) were collected. Regression analyses were conducted to examine the influence of a range of demographic variables on outcomes. Study sample: Participants were 339 children enrolled in the Longitudinal Outcomes of Children with Hearing Impairment (LOCHI) study. Results: Children’s average receptive and expressive language scores were approximately 1 SD below the mean of typically developing children, and scores on speech production and everyday functioning were more than 1 SD below. Regression models accounted for 70–23% of variance in scores across different tests. Earlier CI switch-on and higher non-verbal ability were associated with better outcomes in most domains. Earlier HA fitting and use of oral communication were associated with better outcomes on directly administered language assessments. Severity of hearing loss and maternal education influenced outcomes of children with HAs. The presence of additional disabilities affected outcomes of children with CIs. Conclusions: The findings provide strong evidence for the benefits of early HA fitting and early CI for improving children’s outcomes.
Acknowledgements
We gratefully thank all the children, their families and their teachers for participation in this study. We are also indebted to the many persons who served as clinicians for the study participants or assisted in other clinical or administrative capacities at Australian Hearing, Catherine Sullivan Centre, Hear and Say Centre, National Acoustic Laboratories, Royal Institute for Deaf and Blind Children, Royal Victorian Eye and Ear Hospital Cochlear Implant Centre, the Shepherd Centre, and the Sydney Cochlear Implant Centre. We also thank Vicky Zhang, Julia Day and Kate Crowe for input and advice at various stages of the research.
Declaration of interest
None were declared.
This work was partly supported by the National Institute on Deafness and Other Communication Disorders [Award Number R01DC008080]. The content is solely the responsibility of the authors and does not necessarily represent the official views of the National Institute on Deafness and Other Communication Disorders or the National Institutes of Health. The project was also partly supported by the Commonwealth of Australia through the Office of Hearing Services. We acknowledge the financial support of the HEARing CRC, established and supported under the Cooperative Research Centres Program of the Australian Government. We also acknowledge the support provided by New South Wales Department of Health, Australia; Phonak Ltd.; and the Oticon Foundation.