목적: The aim of the study was to compare the benefits from contralateral implant and hearing aids in children with unilateral cochlear implant (CI), and to identify clinical criteria for selecting the aiding device for the contralateral ear of children with a unilateral cochlear implant (CI). 방법:Sixty-five children, including 36 bilateral CI users and 29 bimodal users, participated in the study. A speech perception test (monosyllabic word test) in noise was administered. The target speech (65dB sound pressure level) was presented from the front loudspeaker, and noise (10dB signal-to-noise ratio) was presented from three directions from in front of the child and 90 to the childs right and left sides. The test was performed using the first CI alone and under bilateral CI or bimodal conditions. The binaural benefits to speech perception in noise were compared between bilateral CI users and bimodal users. 결과:Significant benefits in speech perception in noise were evident in both bilateral CI users and bimodal users in all three noise conditions. In bimodal users, the low-frequency hearing threshold in the nonimplanted ear affected the binaural benefit. Bimodal users with a low-frequency hearing threshold <90 dB hearing level (HL) showed significant binaural benefit in all three noise conditions except for noise presented to the hearing aid side in children with a low-frequency hearing threshold <70 dB HL. By contrast, bimodal users with a low-frequency hearing threshold >90 dB HL showed no significant binaural benefits in all three noise conditions. 결론:Bilateral CI and bimodal listening provide better speech perception in noise than unilateral CI alone in children. The contralateral CI is better than bimodal listening for children with a low-frequency hearing threshold >90 dB HL. A hearing threshold at low frequencies of 1 kHz may be a good criterion for deciding on the type of device for the contralateral ear of children with a unilateral CI.