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目前第二性征现状调查资料的统计,有的只计算各年龄组的发生率既看不出各度发育的平均年龄以及从幼稚状态发育到成熟状态所需要的时间多长,又不利于各指标之间的比较;有的采用中位数法计算各度发育的平均年龄。但后者忽视了被调查者达到各度发育的实际年龄,使计算出来的年龄必然偏高而不能较好地反映出实际情况。本文就仙游县82年7～17岁女学生第二性征现状调查资料,采用中位数法和仿半数致死量(有效量)法,计算第二性征指标各度发育的半数出现年龄进行比较,探讨如下: 目前第二性征的调查多采用现状调查。把表1整理成表2～4,然后作图。可见年龄与乳房各度发育的发生率也呈S形分布,在S形曲线中段的坡度很陡,当年龄稍有增长就能引起发
Current statistics of the second sexual characteristics of the survey data, and some only calculate the incidence of each age group can not see both the average age of each development and development from naive state to mature state how long the time is not conducive to Comparison of indicators; some use the median method to calculate the average age of each development. However, the latter ignored the actual age at which respondents reached all levels of development, making the calculated age inevitably high and failing to better reflect the actual situation. Based on the investigation of secondary sexual characteristics of female students from 7 to 17 years old in Xiangyou County in 1982, the median age and the half-life (effective dose) of median lethal dose For comparison, the discussion is as follows: The current second character survey to use the status quo survey. Sort Table 1 into Table 2 ~ 4, then draw. Visible age and degree of breast development also showed a S-shaped distribution in the S-shaped curve in the middle of the gradient is very steep, when the age can be caused by a slight increase in fat