4.1 Strength and limitation
This is the largest study so far documenting to evaluate and compare the auditory perception performance of children with IEM, and normal cochlear anatomy is one of the strengths.Secondly, all subjects with different ear anomaly that provided maximum and minimum benefit from CI were considered and ranked.Thirdly, the present study adds to the growing body of research that indicates auditory perception performance of children with various IEMs to determine the expectation after cochlear implantation. This study was limited by the absence of language evaluation in the control group. In future studies, both groups can be compared in terms of language performance.