Brudevoll J E, Liestøl K, Walløe L
Ann Hum Biol. 1979 Sep-Oct;6(5):407-16. doi: 10.1080/03014467900003801.
Data from maternity clinics have been used to study the trend in menarcheal age among girls born in Oslo after 1840. The investigation was based on recordings from approximately 50 women from each year. The women were divided into social categories according to their own or their husband's occupation. The results show a trend toward earlier maturation within the working class, which is characterized by two periods of rapid fall in menarcheal age. The first period covers women born between 1860 and 1880, and shows a fall in menarcheal age from about 15.6 to about 14.6 years. During the second period of rapid fall, which covers women born between 1905 and 1940, the menarcheal age was further reduced from about 14.6 to 13.3 years. The age at menarche has been stable at about 13.3 years for women born after 1940. These results contrast with those of some earlier studies of the menarcheal age in Norway. However, it is shown that the discrepancies between these investigations and our own disappear when the same computational methods and the same interpretation of the age recordings are used.
来自产科诊所的数据被用于研究1840年后出生在奥斯陆的女孩月经初潮年龄的趋势。该调查基于每年约50名女性的记录。这些女性根据她们自己或她们丈夫的职业被分为不同的社会类别。结果显示，工人阶级内部呈现出早熟的趋势，其特点是月经初潮年龄有两个快速下降期。第一个时期涵盖1860年至1880年出生的女性，月经初潮年龄从约15.6岁降至约14.6岁。在第二个快速下降期，即涵盖1905年至1940年出生的女性期间，月经初潮年龄进一步从约14.6岁降至13.3岁。1940年后出生的女性月经初潮年龄稳定在约13.3岁。这些结果与挪威一些早期关于月经初潮年龄的研究结果形成对比。然而，研究表明，当使用相同的计算方法和对年龄记录的相同解释时，这些调查与我们自己的调查之间的差异就会消失。
