Tomova A, Genov N, Kumanov F, Robeva R
Akush Ginekol (Sofiia). 2009;48(3):10-4.
The aim of the study was to determine the time of menarche in Bulgarian girls and specify the changes in menarcheal age during 20 century.
We examined in a longitudinal study 93 girls from 3 schools in Sofia in the period from 1994-2000.
Mean age of menarche in girls was 11.96 + 0.75 years, (x + SD), median 12, 00 years. At the age of eleven 41.9% of the investigated girls have already had menarche and at the age of 10--4.3%. By the completion of the 12 years 90.3% were with menarche and at 14 years of age--100%. In a study in Bulgaria, done by the beginning of 20 century (1904-1906), the mean age of menarche was 15.0 + 3.32 years, 3 years later than it was found by us at the end of the century.
We observed a secular trend of earlier time of menarche in Bulgarian girls during 20th century.
本研究的目的是确定保加利亚女孩的初潮时间，并明确20世纪期间初潮年龄的变化。
我们在1994年至2000年期间对索非亚3所学校的93名女孩进行了纵向研究。
女孩的平均初潮年龄为11.96±0.75岁（x±标准差），中位数为12.00岁。11岁时，41.9%的被调查女孩已经经历初潮，10岁时为4.3%。到12岁结束时，90.3%的女孩经历了初潮，14岁时为100%。在保加利亚20世纪初（1904 - 1906年）进行的一项研究中，初潮平均年龄为15.0±3.32岁，比我们在世纪末发现的晚3年。
我们观察到20世纪保加利亚女孩初潮时间存在长期提前的趋势。
