STUDY QUESTION Do birthweight (BW) and co-twin sex influence the age at menarche in twins? SUMMARY ANSWER BW, but not co-twin sex, was associated with age at menarche in twins. However, BW was not associated with age at menarche after controlling for genetics and shared rearing environment. WHAT IS KNOWN ALREADY Nutritional deprivation during critical developmental periods can trigger long-...

AIM To examine the long term effect of bone marrow transplantation (BMT) on ovarian function in girls. METHODS Eighteen girls who underwent BMT before menarche, had been disease free for more than six years, and were over 14 years of age at the time of study were investigated. The preparative regimen consisted of irradiation and chemotherapy. The occurrence of menarche and changes in basal se...

Data for the age of menarche have been collected on 98 female volleyball players and 75 basketball players. The players belonged to four different levels of competition: international, national, intervarsity and district. Menarche is significantly delayed in players as compared with the controls. There is a continuous trend of increase in the age of menarche with the increasing levels of compet...

The goal of this study is to determine the age at menarche of girls from Tanzania examined in 2005 considering their families' social and material status. For the purpose of the analysis of the age at menarche, N = 71 girls were qualified (N = 8 from Dares Salaam and N = 63 from Mafinga) out of N = 98 who took part in the anthropological study. The calendar age of the girls who qualified for th...

We conducted a cross-sectional, school-based survey of sixth-grade girls living in the Reedsburg, Wis area school district to explore factors associated with age at menarche. Data collection included parent and student questionnaires for demographic, menstrual, physical activity, and nutritional information. School nurses conducted physical examinations to provide anthropometric measurements. S...

Absence of the biological father in early childhood has been linked to depressive symptoms in mid-adolescent girls. Earlier studies have linked father absence to early timing of menarche, and early menarche is a risk factor for increased depressive symptoms in adolescence. No studies, however, have examined whether the association between father absence and depressive symptoms may be explained ...

OBJECTIVE The attitudes of girls regarding menarche vary according to their cultural backgrounds. Asian girls may hesitate to discuss menarche. Computer-assisted self-administered interviewing (CASI) is considered a valid and effective tool for investigating the timing of menarche; however, the validity of self-reported menarche data from CASI in Chinese culture is currently unknown. We aimed t...

OBJECTIVE To evaluate the age at menarche of girls, with or without weight excess, attending private and public schools in a city in Southeastern Brazil. METHODS This was a cross-sectional study comparing the age at menarche of 750 girls from private schools with 921 students from public schools, aged between 7 and 18 years. The menarche was reported by the status quo method and age at menarc...

The purpose of this study was to review published studies on the variability of age at menarche and age at menopause throughout the world, and to identify the main causes for age variation in the timing of these events. We first present a summary table including mean (or median) values of the age at menarche in 67 countries, and of the age at menopause in 26 countries. General linear models sho...