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J·M·Tanner博士指出:“儿童少年生长发育的速度能十分准确地反映人群的健康,同时也能反映有关社会因素对儿童健康的作用和影响”。因此“发育速度”是儿童保健工作者研究的课题之一。过去人们做的最多的是“横剖面调查”,而“横剖面调查”在分析“发育速度”时有它的局限性。虽然它能估计一个人群的平均“发育速度”但无法表示其“变异的程度”,因为不同个体青春发育突增期出现的时间有很大的差异,许多不同时间出现的“突增”加在一起求其平均值,“曲线”的高峰就被降低
Dr.J.M. Tanner pointed out: “The growth rate of children and adolescents can accurately reflect the health of the population, but also reflect the social factors on children’s health effects and impact.” Therefore, “developmental speed” is one of the topics studied by child health workers. In the past, “cross-sectional surveys” were the most frequently done, while “cross-sectional surveys” had its limitations in the analysis of “growth rates.” Although it can estimate the average “growth rate” of a population, it can not express its “degree of variation” because there is a large difference in the timing of sudden onset of puberty among different individuals. The “sudden increase” in many different times adds up to Together to find the average, the “curve” of the peak is reduced