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本文着重论述了7～8岁儿童主要染色体异常的发生率。作者对4,342名儿童进行了染色体研究。其中包括:2,186名男孩(1,442名白人,729名黑人,14名其他种族及1名不明种族)和2,156名女孩(1,365名白人,768名黑人及23名其他种族)。被研究儿童的父母67％是白人,32％是黑人及1％是其他人种。母亲的年龄在12～48岁之间。白人大多数为20～29岁(65.2％),而黑人为15～24岁(63.5％)。所有儿童均采用外周血作染色体培养。每一儿童用2～3个细胞以G带法进行照相和分析。每当染色体发现异常,则再以10～
This article focuses on the incidence of major chromosomal abnormalities in children aged 7 to 8 years. The authors conducted a chromosome study of 4,342 children. These include 2,186 boys (1,442 whites, 729 blacks, 14 other races and 1 unidentified races) and 2,156 girls (1,365 whites, 768 blacks and 23 other races). 67% of the children of the studied children are white, 32% are blacks and 1% are other races. Mother’s age is 12 to 48 years old. Most white people are 20-29 years old (65.2%), while blacks are 15-24 years old (63.5%). All children are using peripheral blood for chromosomal culture. Each child with 2 to 3 cells with G-band method of photography and analysis. Whenever chromosome abnormalities, then to 10 ~