1)九大小児科に受診した精神遅滞児1637名について診断名によって分類し,その症型別特徴について検討Lた。2)被験者を男女別に分けると男子にその出現率が高く,症型によってそれぞれ出現率に差があることが認められた。3)精神遅滞児の中には両親が血族結婚の者が多く,出生順位,出生時の母親の年令も症型によっては関係の深いものがある。4)緒神遅滞児の出産状態や生下時体重をみると障害があったり,未熟であった者が多い。5)身体的に見て精神遅滞児の体格は悪く,特に体重,頭囲,栄養の面では劣っているが,体質的には正常児と差はたい。しかし骨発育では発育が遅れており,脳波でも障害のある者が多い。6)精神的発達ではそれぞれの症型によって特徴があり,運動性の欠陥を第一次的障害に持ち,二次的に精神的遅れを示したものと,精神的遅れを一次的の障害に持ち,運動面の遅れを二次的に示しているものとがある。

The purpose of this research was to analyze the physical and psychological characteristics of mentally retarded children. During the period from 1959 to 1962, medical and psychological examinations were given to 1,637 mentally retarded individuals at the out-patient clinic of the Department of Pediatrics of Kyushu University. The analysis of these 1,637 cases showed that they could be handled in ten subgroups by clinical diagnosis, those were, cerebral palsy group (898 cases), feeblemindedness group (280 cases), mongolism group (94 cases), athyroidism group (47 cases), microcephaly group (26 cases), hydrocephalus group (56 cases), hereditary degenerative brain condition group (12 cases), speech retardation group (45 cases), deaf group (65 cases) and chronic encephalitis group (109 cases). With the resulting data on hand, the author analyzed the physical and psychological characteristics exhibited by the ten main types of the mentally retarded children. The results were as follows : 1. The mentally retarded appeared at the ratio of six boys to four girls. 2. Abnormal births, as well as the consanguineous marriages, were significantly more in the men-tally retarded than the control group. 3. The physical constitutions of the patients were generally bad, especially weight and head circumference being inferior. Their physical predisposition was usually normal, but bone growth was late in general. Electroencephalography was abnormal in many cases. 4. Patterns of mental development were different among clinical types. One had primarily motor disorder and possessed secondarily mental retardation, (cerebral palsy, athyroidism, hydro-cephaly, deaf, speech retardation), others had rudimentary mental retardation and exposed secondarily motor retardation (feeblemindedness, mongolism, mycrocephaly, hereditary degeneration, brain condition, chronic encephalitis). Further research is needed in order to verify those conclusions.