Zurlo de Mirotti S M, Lesa A M, Barrón de Carbonetti M
Cátedra de Pediatría y Neonatologia, U.N.C.
Rev Fac Cien Med Univ Nac Cordoba. 1995;53 Suppl:7-15.
Our purpose was to determine the mean age of menarche in young females of our population. To relate menarche with maturation stages of secondary sex character. To observe if the secular trend persist after the first observation. Consistently two temporal observations spaciated for 10 years were performed. Two hundred and eighty three healthy women who belonged to a higher middle-level and attending a high school from Cordoba National University were studied. Such women were in an age range between 11.0 to 18.0 years. Anthropometric and biological maturation examination were undertaken (Tanner). The mean age of onset of secondary sex characters was determined in a longitudinal follow-up group (54 girls). The mean age of menarche in the overall sample was determined by the retrospective method and in the subsample of 54 girls longitudinally followed in the 70-80 decade was determined by the prospective method in which the menarche was correlated with stages of mamary development (B) an pubic hair (PH). The mean age of menarche in 146 young females with a follow-up from 1.981 through 1.990 was determined. In the overall sample the mean of age of menarche was of 12.59 years +/- 1.17; in the subsample (54 girls) of 12.75 years +/- 1.03. In this subsample 70.37% of them has the menses in the B3 stage, 22.22% in B4, 5,5% in B2 and 1.85% in B5. 74.07% PH3, 18.51% in PH4, 0.52% in PH2 and none in PH5. In the sample of 146 young females with a follow-up between 1981 and 1990 the mean age of menarche was 12.36 years. If this result is compared with that of the 54 girls longitudinally followed in the prior decade and with the overall sample, a difference of 0.39 years and 0.23 years respectively is proved. This difference favoring an earlier age of menarche would show: 1 degree) That in our environment the secular trend is maintained, the age advances 4 months every 10 years and 2 degree) That the longitudinal prospective method is more reliable than the retrospective one.
我们的目的是确定我们研究人群中年轻女性的初潮平均年龄。将初潮与第二性征的成熟阶段相关联。观察在首次观察后长期趋势是否持续存在。连续进行了两次间隔10年的时间观察。对283名来自科尔多瓦国立大学高中部且健康的女性进行了研究。这些女性年龄在11.0至18.0岁之间。进行了人体测量和生物学成熟度检查（坦纳法）。在一个纵向随访组（54名女孩）中确定了第二性征开始出现的平均年龄。总体样本中初潮的平均年龄通过回顾性方法确定，在70 - 80年代纵向随访的54名女孩的子样本中，通过前瞻性方法确定初潮年龄，该方法将初潮与乳腺发育阶段（B）和阴毛（PH）相关联。确定了1981年至1990年期间146名年轻女性的初潮平均年龄。在总体样本中，初潮的平均年龄为12.59岁±1.17；在子样本（54名女孩）中为12.75岁±1.03。在这个子样本中，70.37%的女孩在B3阶段出现月经，22.22%在B4阶段，5.5%在B2阶段，1.85%在B5阶段。74.07%处于PH3阶段，18.51%处于PH4阶段，0.52%处于PH2阶段，PH5阶段无人出现。在1981年至1990年期间随访的146名年轻女性样本中，初潮的平均年龄为12.36岁。如果将此结果与前十年纵向随访的54名女孩以及总体样本的结果进行比较，分别证明相差0.39岁和0.23岁。这种有利于初潮年龄提前的差异表明：1）在我们的环境中，长期趋势得以维持，每10年初潮年龄提前4个月；2）纵向前瞻性方法比回顾性方法更可靠。
