Boldsen J L, Jeune B, Bach-Rasmussen K L, Sevelsted M, Vinther E
Institut for Sygdomsforebyggelse og Helsetjenesteforskning, Odense Universitet.
Ugeskr Laeger. 1993 Feb 15;155(7):482-4.
The average age at the menarche has decreased from the 1850s to the 1950s. It is controversial whether there has been a continued decrease since the 1950s. The object of this investigation is to illustrate whether this trend has continued into the 1980s. This study is based on the ages at the menarche as recalled by 908 girls aged 14-16 years in 40 schools in Odense. The information was obtained during intervals of differing lengths and consequently, the parameters of the distribution of the age at the menarche were estimated in a randomly grouped normal distribution. The average age at the menarche was found to be the same throughout the municipality (13.27 years; 95% confidence limit 13.20-13.35). The variations were found to be significantly differentiated by the type of school district. The variations were low in the suburbs and in the surrounding rural districts, higher in the inner city areas and highest among girls attending private schools. Compared with the results from other recent Danish studies, these findings suggest a halt in the decline of the average age at the menarche, which may be temporary.
从19世纪50年代到20世纪50年代，月经初潮的平均年龄有所下降。自20世纪50年代以来是否持续下降存在争议。本调查的目的是说明这一趋势是否持续到了20世纪80年代。本研究基于欧登塞40所学校908名14至16岁女孩回忆的月经初潮年龄。这些信息是在不同时长的时间段内获取的，因此，月经初潮年龄分布的参数是在随机分组的正态分布中估计的。整个城市的月经初潮平均年龄相同（13.27岁；95%置信区间13.20 - 13.35）。发现这些差异在学区类型上有显著区分。郊区和周边农村地区的差异较小，市中心地区较高，私立学校女生中的差异最大。与丹麦近期其他研究结果相比，这些发现表明月经初潮平均年龄下降趋势停止，这可能是暂时的。
