Herbst D S, Baird P A
Am J Ment Defic. 1983 Mar;87(5):506-13.
Nonspecific mental retardation (i.e., mental retardation with no known etiology) at all levels of functioning was investigated in the population of British Columbia, with ascertainment through the British Columbia Health Surveillance Registry. The age-specific prevalence of nonspecific retardation for the 15- to 29-year age group, where ascertainment was best, was 4.4 per 1,000 population at year-end 1978. A minimum incidence of 5.2 per 1,000 male live births and 4.0 per 1,000 female live births was calculated for the 1952-1965 birth cohort. Data on the number of cases associated with either microcephalus, hydrocephalus, epilepsy, or cerebral palsy were presented. Seventy-three percent of the cases with mild mental retardation had no associated disability, whereas only 26.9 percent of profoundly retarded cases were without any of these conditions. Survival rates varied with respect to the level of mental retardation.
通过不列颠哥伦比亚省健康监测登记处，对不列颠哥伦比亚省人群中各功能水平的非特异性智力迟钝（即病因不明的智力迟钝）进行了调查。在确定情况最佳的15至29岁年龄组中，1978年年末非特异性智力迟钝的年龄别患病率为每1000人口4.4例。计算出1952 - 1965年出生队列中男性活产儿的最低发病率为每1000例5.2例，女性活产儿为每1000例4.0例。列出了与小头畸形、脑积水、癫痫或脑瘫相关的病例数。轻度智力迟钝病例中有73%没有相关残疾，而重度智力迟钝病例中只有26.9%没有这些情况。生存率因智力迟钝程度而异。
