To investigate the potential effects of common early life exposures on age at menarche, the authors examined data collected in a follow-up study of pregnancies that occurred during the 1960s in California. Among 994 female offspring interviewed as adolescents, 98% had started their menstrual periods at a mean age of 12.96 years. After adjustment, the mean age at menarche was a few months earlie...

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...

Intrauterine exposure to the rainy season in the tropics may be accompanied by high rates of infection and nutritional deficiencies. It is unknown whether this exposure is related to the extrauterine timing of development. Our aim was to evaluate the relations of prenatal exposure to the rainy season and altitude of residence with age at menarche. The study included 15,370 girls 10 to <18 years...

OBJECTIVE To estimate the mean age at menarche and its association with nutritional status in Brazilian adolescents. METHODS The study sample included female adolescents aged 12-17 who participated in a multicenter, school-based, country-wide, cross-sectional study entitled The Study of Cardiovascular Risk in Adolescents (Estudo de Riscos Cardiovasculares em Adolescentes [ERICA]). Mean and me...

prediction of the onset of menstruation (menarche age) using height, weight and body mass index (bmi) is a major health procedure. the present study was conducted to determine the relationship between anthropometric indices and menarche age in 488 girls 11-17 years in southern iran (kish island) in 2011.data was collected using questionnaires as well as measurements of the children's height and...

BACKGROUND The onset of menstruation is part of the maturation process. However, variability in menstrual cycle characteristics and menstrual disorders are common. The purpose of this study was to determine the age at menarche and patterns of menstruation among school adolescent girls and explore its variation across socio-economic and demographic factors. METHODOLOGY This is a cross-sectiona...

Objective: Puberty is the most prominent stage of life. The purpose of this study was to evaluate effects of puberty health education on promoting of its awareness in girls. Methods: In an interventional quasi-experimental study (pre and post test), awareness, attitude and practice of 500 high school first grade student girls evaluated before and after health education in Yazd in 20042005 . Res...

The mean and median age at menarche in 360 Khasi girls was found to be 13.22 ± 0.88 and 12.13 ± 0.79 years, respectively; socio-economic status was observed to be a strong predictor of age at menarche in this population.

Predicting the onset of menstruation (menarche age) and measuring height, weight and Body Mass Index (BMI) are among the major health information. Due to the importance of this issue, the present study was conducted to determine the anthropometric indexes and their relationship with menarche age in female students of Sabzevar, Iran in 2010. This cross sectional descriptive study was conducted o...