To evaluate the possible relationship between hearing im pairm ent and schizophrenic disorder, pure tone audiom etry was adm inistered to 195 hospitalized schizophrenics m eeting the crite ria of DSM-111 and a control group o f 307 norm al people. Some aspects concerning the assessment of hearing im pairm ent (age o f onset, duration, type, class and severity o f hearing im pairm ent) w ere investigated. N either the congenitally o r prelingually deaf patients nor the eldery adults over 45 years old w ere included in both groups. Schizophrenics w ere subdivided into tw o subgroups of those w ith hearing im pairm ent (N = 1 7 ) and those w ith norm al hearing (N = 1 7 8 ) and then the onset, subtype (paranoid o r non-paraniod) and duration of schizophrenia plus the experience and persistence o f auditory hallucination w ere compared between the subgroups. The results w ere as follow s : 1) Hearing im pairm ent (hearing loss o f greater than 25 dB as pure tone average in one o r both ears) was identified in 17 cases (8.7% ) o f the schizophrenic group and 8 cases (2.6%) o f the control group (p (0.01). 2) Mean loss o f hearing in both ears was more severe in hearing impaired patients o f the schizophrenic group than in hearing im paired patients o f the control group (p 〈0.05). 3) Onset o f schizophrenia was la te r in schizophrenics w ith hearing im pairm ent than in scnizophrenics w ith normal hearing (p 〈0.05). 4) The long standing o r persistant auditory hallucination occured m ore often in schizophrenics w ith hearing im pairm ent than in schizophrenics w ith norm al hearing (p 〈0.01).
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