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我们在 1990到 1991年和 1998到 1999年对本县高考体检中的男生作了性器官发育检测。将 14～ 2 1岁随机分成 4组 ,按不同民族分别进行统计分析 ,结果报告如下 :资 料见表 1。表 1 各年龄组 8年前后生殖器官发育测量结果对比年龄组别年度例数身高 (ｃｍ) ｘ ｓ 体重 (ｋ
From 1990 to 1991 and from 1998 to 1999, we conducted tests on the development of sexual organs among male students in the county college entrance examination. The 14 to 21 year old were randomly divided into 4 groups and statistical analysis was conducted according to different ethnic groups. The results were reported as follows: The information is shown in Table 1. Table 1 Measurements of genital development at 8 years of age in each age group Comparison of age groups Annual case height (cm) x s Weight (k