5|CONCLUSIONS
In conclusion, this study provides evidence that children with severe or profound hearing loss could have comprehensive developmental delay. The developmental delay occurred not only in verbal but also non-verbal aspects. Although with developmental delay, children with LVAS had the equal developmental level in comparison with children with same hearing impairments. According to our results, whether the vestibular dysfunction induced by LVAS had effects on developments including motor developments couldn’t be concluded. Longitudinal follow-up study and vestibular tests should be adopted to further address these issues. In addition, we found that age of intervention was the risk factor for developments of LVAS children. As the age of intervention was delayed, the delay in the development domains seemed worse and the obvious delay of developments stared from 12 months-old. Therefore, early diagnosis and intervention was proposed.