[Age at menarche and the investigation of selected biophysical parameters in the course of menarche].

Design: The aim of our study was a currently clinical analysis of menarche.

Materials And Methods: The mean age of menarche was investigated in 4497 girls between 1975-1997 69 girls were examined throughly in the course of menarche. Age at menarche, body weight, height, body mass index (BMI), some of the hormones and ultrasonography of sexual organs were investigated.

Results: We demonstrated that mean age of menarche was 13.1 year, height 159.2 cm, weight 48 kg, body mass index (BMI) 18.9. Mean size a mucous membrane was 5.7 mm. Ratio of uterus to cervix indicated dominance of the uterus. Mean levels of hormones were: E2--89.4 pg/ml, FSH--6.2 UI/ml, LH--5.7 UI/ml. Relation LH to FSH was nearly 1.