Background: The average age at menarche (AAM) has declined around the world, which is widely attributed to improvements in nutrition. This study was conducted to investigate the association between dietary patterns and early menarche ( Materials and Methods: This case-control study was carried out on 400 elementary school girls (200 early mena...

Understanding the regulation of puberty timing has relevance to developmental and human biology and to the pathogenesis of various diseases. Recent large-scale genome-wide association studies on puberty timing and adult height, body mass index (BMI) and central body shape provide evidence for shared biological mechanisms that regulate these traits. There is a substantial genetic overlap between...

A growing body of evidence suggests that chemicals interfere with the age onset menarche. We conducted a review in order to demonstrate relationship between several categories and searched for English language papers using Medline/PubMed database until April 2023. The chemical factors found affect menarche were prenatal antenatal smoke, phthalates, phenols, organochlorines, perfluoroalkyls poly...

Objective: To identify the level of readiness elementary school students when facing first menstruation (menarche)Methods: The design this research is a descriptive study through use data collection techniques, namely saturated sampling or total sampling. In study, variable in (menarche). sample used was 36 respondents, they were who met inclusion criteria that 3rd grade (aged 9-10 years), had ...

The energy demands of pregnancy and lactation together with the accumulation of stored fat in human females during development suggest that a critical level of fat may be required for menarche; but multivariate analyses have supported the alternative view that skeletal growth is the main factor. However, significant differences between upper- and lower-body (gluteofemoral) fat suggest that fat ...

The present study explores the effect of age at menarche on the incidence of asthma during early adulthood. The analysis was based on Canadian girls followed up from 8-11 to 18-21 years of age during the first 6 cycles (1994-2005) of the National Longitudinal Survey of Children and Youth. Early menarche was defined as 1 standard deviation less than the average age at menarche. Asthma occurrence...

Girls who grow up in households with an unrelated adult male reach menarche earlier than peers, a finding hypothesized to be an evolutionary strategy for families under stress. The authors tested the alternative hypothesis that nonrandom selection into stepfathering due to shared environmental and/or genetic predispositions creates a spurious relation between stepfathering and early menarche. U...

The interrelationships among five measures of physiologic maturity for 50 French-Canadian girls are evaluated--menarche, peak height velocity (PHV), 75% skeletal maturity, appearance of the ulnar sesamoid, and 90% dental development. The mean ages of occurrence of the events differed significantly (P less than 0.01). Menarche and 90% dental maturity showed the least variability. Ages of PHV, me...

Menarcheal age of a sample of Portuguese university students (n = 3366), born between 1972 and 1983, age 18-23 years, was analyzed. The influence of parents' educational level and occupation, family size, birth order, and degree of urbanization of girl's locality of residence during childhood and adolescence were analyzed as well as secular trend in the Portuguese population. Mean age at menarc...