목적: This study aimed to analyze the questionnaire results and behavioral test outcomes of patients in Korea suspected of having auditory processing disorder (APD), to identify their characteristics and estimate the lesion sites 방법:The study included 48 participants with symptoms suggestive of APD, and 30 control participants. All participants had an average pure-tone audiometry threshold of <20 dB in both ears and a Mini-Mental State Examination score of >27. The APD questionnaire, consisting of 25 items with a total score of 100, was developed based on the AAA Clinical Practice Guideline, Auditory Processing Domains Questionnaire, and the Speech and Spatial and Qualities of Hearing Scale. The behavioral tests included: 1) 3-digit dichotic test, 2) dichotic constant-vowel listening test, 3) frequency pattern test, 4) temporal modulation transfer function test, 5) compression 60% speed up listening test, and 6) speech-in-noise test. The criteria for diagnosing APD were defined as scores more than 2 standard deviations below the mean on at least two different behavioral test domains. 결과:Among the 48 participants, 39 (37.78 ± 9.93 years; M:F = 13:26) were diagnosed with APD (APD+ group), while the remaining 9 subjects were categorized as the APD- group. The APD+ and APD- groups scored (50.79 ± 16.68 and 52.22 ± 17.37, respectively) higher than the normal group (19.8 ± 11.79) on the questionnaire (p < 0.001), but there was no significant difference between the APD+ and APD- groups. All tests, except the temporal modulation transfer function test, showed significantly poorer performance in APD+ group compared to the control group (all p < 0.05). The questionnaire scores were well correlated with almost all behavioral test scores. Based on the behavioral test results, the estimated lesion locations were as follows: right auditory cortex in 14 cases, right auditory cortex or corpus callosum in 6 cases, left auditory cortex in 3 cases, left auditory cortex or corpus callosum in 4 cases, corpus callosum in 1 case, and indeterminate in 11 cases. 결론:The study demonstrates that a significant portion of individuals in Korea who self-report symptoms suggestive of APD actually have APD. The findings also suggest that the right auditory cortex may be a common lesion site in APD cases, although further research is needed to confirm these results and better understand the underlying neural mechanisms.