1876年至1981年的美国父亲年龄数据。

Neurofibromatosis Pub Date : 1988-01-01

V M Riccardi

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摘要

在1876年至1981年期间选定的年份，逐项列出了平均父亲年龄，并说明了这些数字的计算方法。在此期间，父亲的平均年龄从36.9岁的高点降至1981年的28.5岁。这一变化的原因是，高龄父亲的生育数量的绝对和相对减少，而年轻父亲的生育数量的绝对和相对增加。

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American paternal age data for selected years from 1876 to 1981.

For selected years in the time span of 1876 through 1981, mean average paternal ages are itemized and the methods for the calculation of these figures are illustrated. For this time period, mean average paternal ages dropped from a high of 36.9 years to 28.5 years in 1981. This change was accounted for by an absolute and relative decrease in the number of births to older fathers and by an absolute and relative increase in births to younger fathers.

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来源期刊

Neurofibromatosis

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