• This risk is increased with longer hormonal exposure in women with early menarche (onset of menstruation) before the age of 12 and late menopause (after the age of 55). (singhealth.com.sg)
  • Women with multiple sclerosis (MS) who had never given birth and those who began menopause prematurely developed progressive MS earlier, a single-center observational analysis suggested. (medpagetoday.com)
  • Similarly, prevention of early menopause, such as avoiding oophorectomy, may help delay progressive MS onset and prevent long-term disability accumulation. (medpagetoday.com)
  • Menopause at age 45 or younger was considered premature/early. (medpagetoday.com)
  • Time from onset of MS relapses to onset of progressive MS was shorter for women with premature/early menopause (mean 12.9 years) than for women with normal menopause (mean 17.8 years). (medpagetoday.com)
  • The findings may indicate why some women go through puberty and menopause abnormally early or late. (newscientist.com)
  • As with menarche, these variants explain just a small percentage of the differences between the age at which women go through menopause, which range between about 40 and 60. (newscientist.com)
  • However, this shouldn't hinder efforts to understand the biology of menarche and menopause and eventually target them with drugs, he says. (newscientist.com)
  • Early and late menopause, age at first live birth, years after last birth, and history of irregular menses were associated with increased risks for AF development among women. (medpagetoday.com)
  • In the model adjusting for age only, age at menarche, age at menopause, years after menopause, age at first live birth, years since last birth, number of live births, and total reproductive years were associated with risk of new-onset AF. (medpagetoday.com)
  • Older age at menopause, older age at first live birth, and longer reproductive lifespan were associated with a lower risk of incident AF. (medpagetoday.com)
  • Both early menopause (younger than 35 years) and late menopause (60 years or older) were also associated with AF development. (medpagetoday.com)
  • This cancer usually develops after menopause, most often in women aged 45 to 74. (merckmanuals.com)
  • Among these factors are obesity, a high-fat diet, and reproductive factors such as nulliparity, polycystic ovary syndrome, early menarche, and late menopause. (cancer.gov)
  • A study presented at the International Association for the Study of Lung Cancer 2023 World Conference on Lung Cancer revealed that key reproductive factors such as early menopause, shortened reproductive span, and early age at first birth are associated with elevated risks of lung cancer in women. (news-medical.net)
  • These factors included early menarche (age ≤ 11 years), early menopause (age ≤ 46 years or age of 47-49 years), a shorter reproductive span (age ≤ 32 years or age of 33-35 years), and early age at first birth (≤ 20 years or age of 21-25 years). (news-medical.net)
  • Stratified analysis revealed that some reproductive factors, especially early menopause, shortened reproductive span, and early age at first birth, displayed a substantially stronger association with elevated lung cancer risk, particularly non-small cell lung cancer (NSCLC), in populations with high genetic susceptibility and detrimental behaviors. (news-medical.net)
  • Early menarche, early menopause, and a shortened reproductive life span are associated with higher risks of incident lung cancer, especially NSCLC, in subpopulations with specific genetic risk and lifestyle choices. (news-medical.net)
  • Menstruation, and with it the possibility of pregnancy, ceases after menopause, which usually occurs between 45 and 55 years of age. (definitions.net)
  • This continues until the woman reaches menopause, usually around the age of 50 years. (wikibooks.org)
  • From menarche to menopause, uterine fibroids can develop inside a woman's body anytime. (novaivffertility.com)
  • Age at menarche, the onset of first menstruation in females, indicates the start of reproductive maturity and is a commonly reported marker of pubertal timing. (nature.com)
  • The average age of menstruation in the United States is about 12 years. (medlineplus.gov)
  • The study also suggests that girls who start menstruation before the age of 10 or younger, are at an increased risk of having a stroke before the age of 65. (medicaldaily.com)
  • Menstruation usually begins around age 11, but it may happen as early as age 8, or as late as age 16. (drpaul.com)
  • To date, however, few if any studies have focused on the association between early menarche (generally defined as the occurrence of first menstruation before 12 years of age) and overall cardiovascular health. (menopause.org.au)
  • ANN ARBOR-A study links low vitamin D in young girls with early menstruation, which is a risk factor for a host of health problems for teen girls as well as women later in life. (umich.edu)
  • Worldwide, there has been a slow decline in the age of the first menstruation, or menarche, for years, which Villamor says suggests an environmental cause, since the genetics that trigger puberty haven't changed. (umich.edu)
  • If we learn what is causing the decline in age of first menstruation, we may be able to develop interventions" to prevent premature menarche. (umich.edu)
  • Early menstruation is a risk factor for behavioral and psychosocial problems in teens. (umich.edu)
  • Girls from higher socioeconomic status and those that lived with both parents by age 14 were less likely to experience menarche at an early age. (cdc.gov)
  • For instance, one study found that Icelandic girls with two genetic letter Ts at a spot near LIN28B experience menarche 2.4 months earlier, on average, than girls with two Cs at that site. (newscientist.com)
  • Menarche refers to the first menstrual period. (cdc.gov)
  • Is this the first report on age of first menstrual period? (cdc.gov)
  • 2004). In addition, age at menarche (first menstrual period), premenopausal ammenorrhea (absence or discontinuation or abnormal stoppage of the menstrual periods), and postmenopausal status may negatively impact OP risk in women. (unm.edu)
  • For most girls, their first menstrual period , or menarche (say: MEH-nar-kee), begins about 2 years after she first starts to get breasts. (kidshealth.org)
  • In this analysis, Zeydan and colleagues looked at survey data from 137 postmenopausal MS patients seen at the Mayo Clinic, and records of 396 age-matched controls without MS, from the Mayo Clinic Cohort Study of Oophorectomy and Aging-2 , a population-based cohort in Olmsted, Minnesota. (medpagetoday.com)
  • Prenatal exposure to mixtures of persistent endocrine disrupting chemicals and early menarche in a population-based cohort of British girls. (cdc.gov)
  • Precocious means early or premature. (yahoo.com)
  • BACKGROUND There is a debate about the possible progression of idiopathic premature thelarche towards precocious or early puberty. (bmj.com)
  • OBJECTIVE To evaluate height and age at onset of puberty in a group of girls with a history of idiopathic premature thelarche. (bmj.com)
  • STUDY DESIGN The height and age at onset of puberty of 42 girls now over 10 years of age who were diagnosed with isolated premature thelarche before the age of 3 years were evaluated. (bmj.com)
  • CONCLUSIONS Isolated premature thelarche with onset before 3 years of age progresses towards precocious puberty, although this was consistent with the maternal age of menarche. (bmj.com)
  • PARTICIPANTS: An ethnically diverse cohort of 330 fifth-grade girls (mean age, 11.25 years) from 3 metropolitan areas. (rand.org)
  • Between 1930 and 1990 mean menarcheal age of this cohort of women decreased from 13.88 to 12.98 years (-0.15 years per decade) and mean height of the cohort increased from 152.33 to 158.43 cm (+0.99 cm per decade). (who.int)
  • Controls were from the Mayo Clinic Cohort Study of Oophorectomy and Aging-2, made possible by the Rochester Epidemiology Project. (medpagetoday.com)
  • The researchers used data from the UK Biobank, a prospective cohort study that enrolled more than half a million participants aged 40 to 69 years between 2006 and 2010. (medpagetoday.com)
  • Dietary intake of advanced glycation endproducts (AGEs) and cancer risk across more than 20 anatomical sites: A multinational cohort study. (who.int)
  • Menarche (the beginning of menstrual periods) typically occurs about 2 years after early breast and pubic hair appear. (medlineplus.gov)
  • A higher proportion of young girls are experiencing menarche now than in earlier time periods. (cdc.gov)
  • 2 Data was collected by interviewing participants over 14 years (in 4 different time periods or waves) to determine the age at menarche (used as a proxy for pubertal development) and development and duration of depressive symptoms and antisocial behaviors. (contemporarypediatrics.com)
  • Across hundreds of thousands of single letter differences peppered across the human genome, all four research teams found genetic variations near the gene LIN28B associated with earlier or later first periods. (newscientist.com)
  • Girls are starting their periods at an ever earlier age so it's good to be ready. (parentingwithouttears.com)
  • Mondays support "plastic-free periods" and have a great menarche pack. (parentingwithouttears.com)
  • A lack of periods, known as amenorrhea, is when periods do not occur by age 15 or have not re-occurred in 90 days. (definitions.net)
  • After considering these international findings, we decided to investigate the age at menarche, pubarche and telarche in a representative sample of Mexican girls and to analyze these data in conjunction with anthropometrical variables, age at menarche of mothers and sisters, regular exercise, emotional stress, and other factors to ascertain if any of them are predictors of the age of the onset of puberty. (scirp.org)
  • The researchers attributed the early onset of puberty in boys to an increase in BMI (body mass index). (yahoo.com)
  • The average age of onset of puberty is at 11 for girls and 12 for boys. (wikipedia.org)
  • To assess the life history consequences of cow milk consumption at different stages in early life (prenatal to adolescence), especially with regard to linear growth and age at menarche and the role of insulin-like growth factor I (IGF-I) in mediating a relationship among milk, growth and development, and long-term biological outcomes. (nih.gov)
  • Milk has been associated with early menarche and with acceleration of linear growth in adolescence. (nih.gov)
  • NHANES data show a positive relationship between milk intake and linear growth in early childhood and adolescence, but not middle childhood, a period of relatively slow growth. (nih.gov)
  • In early adolescence, the peer group most often consists of non-romantic friendships. (medlineplus.gov)
  • Pediatricians need a better understanding of the effects of early puberty for girls beyond adolescence into adulthood. (contemporarypediatrics.com)
  • It is well known that early puberty in girls is associated with a myriad of psychosocial effects that make them vulnerable to depression and antisocial behavior during adolescence. (contemporarypediatrics.com)
  • Into this gap comes research from a new study that tracked the psychosocial effects of early puberty beyond adolescence and into adulthood to look at how long the psychosocial effects of early puberty may last. (contemporarypediatrics.com)
  • Using various regression models to assess associations of age at menarche to depressive symptoms and antisocial behaviors, the investigators found a significant association between later ages of menarche and lower levels of depressive symptoms during adolescence and over time. (contemporarypediatrics.com)
  • For example, compared with a girl with an onset of menarche at age 12 years (the average age), a girl who has an onset of menarche at age 10 years is 8% more likely to have depressive symptoms in adolescence and 6% more likely to still have depressive symptoms in her 20s. (contemporarypediatrics.com)
  • When looking at a girl who begins menarche at age 8 years, the percentages of depressive symptoms increase to 25% in adolescence and 20% into her 20s. (contemporarypediatrics.com)
  • For example, the study found that compared with a girl with an onset of menarche at age 12 years, girls with early menarche at age 10 years had a 5% greater chance of displaying antisocial behavior in adolescence that persisted into their 20s (although only marginally significant). (contemporarypediatrics.com)
  • Adolescence (from Latin adolescere 'to mature') is a transitional stage of physical and psychological development that generally occurs during the period from puberty to adulthood (typically corresponding to the age of majority ). (wikipedia.org)
  • Age provides only a rough marker of adolescence, and scholars have not agreed upon a precise definition. (wikipedia.org)
  • Facial hair is often present in late adolescence, around ages 17 and 18, but may not appear until significantly later. (wikipedia.org)
  • Childhood to Early Adolescence. (cdc.gov)
  • Death rates rise sharply from early adolescence (10-14 years) to young adulthood (20-24 years), the causes varying by region and sex. (who.int)
  • The statute of the child and the adolescent, through the Law number 8.069/90, defines that the adolescence corresponds to the period of life which ranges from 12 to 18 years of age 3 . (bvsalud.org)
  • On gynecologic history, she is G2 P2 [gravida 2, para 2] and her first pregnancy was at age 27. (onclive.com)
  • The researchers also saw a pregnancy-dose relationship with the age that women reached EDSS 6. (medpagetoday.com)
  • Chemical mixture exposures during pregnancy and cognitive abilities in school-aged children. (cdc.gov)
  • Despite nearly two decades of decline, current adolescent pregnancy rates in the United States are among the highest in the industrialized world, 1 and approximately one-third of U.S. females become pregnant before age 20. (cdc.gov)
  • Childhood obesity is associated with a number of risk factors related to pregnancy and early life, such as parental obesity, birth weight, breastfeeding vs formula feeding, and rapid weight gain during infancy. (medscape.com)
  • Overweight/obesity was associated with these factors in the mothers - younger age, higher BMI, earlier age of menarche, higher education levels, first pregnancy, and cesarean delivery . (medscape.com)
  • The inconsequential exercise of sexuality may generate innumerous conflicts and interfere wityh each adolescent's plans for the future, resulting in early pregnancy, for example. (bvsalud.org)
  • Select variables related to pregnancy and hysterectomy have been excluded from this public use data file for those aged 12-19 years and for women over 44 years due to disclosure risks. (cdc.gov)
  • This data file contains complete records for variables related to pregnancy only for females aged 20-44 years. (cdc.gov)
  • Early lead exposure and pubertal development in a Mexico City population. (cdc.gov)
  • Objectives: To examine the association of prenatal and early childhood lead exposure with pubertal stages among 264 boys and 283 girls aged 9.8-18.0 years in Mexico City. (cdc.gov)
  • Conclusions: These data suggest that higher prenatal and early childhood exposure to lead may be associated with delayed pubertal development in girls but not boys. (cdc.gov)
  • MAIN EXPOSURE: Early onset of menarche, parental nurturance, knowledge of the child's activities, and communication. (rand.org)
  • Exposure occurred in the early 1950s. (cdc.gov)
  • Gestational and childhood exposure to per- and polyfluoroalkyl substances and cardiometabolic risk at age 12 years. (cdc.gov)
  • Prenatal exposure to per- and polyfluoroalkyl substances (PFAS) and neurobehavior in US children through 8 years of age: The HOME study. (cdc.gov)
  • Early menarche was associated with a high risk of diabetes, obesity , and high WHR. (bvsalud.org)
  • On the other hand , late menarche was associated with higher rates of hypertension , stroke , and diabetes but a lower risk of MM, rheumatoid disease , obesity, abdominal obesity , and WHtR. (bvsalud.org)
  • Is early age at menarche a risk factor for endometriosis? (ox.ac.uk)
  • CONCLUSIONS: Early puberty is a risk factor for delinquency, and early puberty combined with low parental nurturance, communication, or parental knowledge of the child's activities presents a risk for aggressive behavior in early adolescent girls. (rand.org)
  • We decided to do a report on this topic because menarche is a biological milestone of the start of the period in which women can potentially get pregnant and because early menarche is associated with greater risk of health problems such as breast cancer, liver disease, etc. (cdc.gov)
  • Some risk factors such as gender and age, or those related to our environment cannot be changed (non-modifiable), while others are modifiable as they are related to our lifestyle choices. (singhealth.com.sg)
  • This risk also increases with age. (singhealth.com.sg)
  • While this does not reduce the risk of cancer development, it does improve outcome by discovering the cancers in earlier stages, allowing earlier treatment and hence better outcomes. (singhealth.com.sg)
  • If this happens early, "you're at risk for not getting as tall as would be expected," says Louis-Obike. (yahoo.com)
  • Risk models were adjusted for age only and for multiple cardiovascular risk factors. (medpagetoday.com)
  • for MLH1 carriers the lifetime risk at age 70 years is 25% while MSH2 mutation carriers have a 35% to 40% lifetime risk of endometrial cancer by age 70 years. (cancer.gov)
  • Documented, external risk factors include radiation (especially at a young age), hormone replacement therapy (the "Pill" and estrogen for post-menopausal women), and diet, especially fat, alcohol and refined sugars. (dremilykane.com)
  • Lowering the age at menarche and risk of early menarche in a population of Spanish postmenopausal women during the past two decades. (aeem.es)
  • The study sought to identify potential risk factors and further analyze their impact on specific subgroups, including age, smoking status, body mass index (BMI), genetic risk, and histological subtypes. (news-medical.net)
  • Early menarche has been associated with many cardiovascular disease (CVD) risk factors, but little is known about its association with overall heart health. (menopause.org.au)
  • Also, girls who have an earlier menarche appear to have increased risk of developing cardiometabolic diseases and cancer?particularly breast cancer, as adults. (umich.edu)
  • The prevalence of risk factors is changing by age group, geographic region, and over time. (karger.com)
  • Similar benefits were observed when the researchers applied their models to prediabetes: "…using a personalized risk model, we can improve the classification of patients who are prediabetic and identify patients at risk 2 years earlier compared to classification based merely on current glucose levels. (blogspot.com)
  • In a longitudinal population study of 9,067 Australian women, researchers found that those who began smoking by age 13 had the greatest risk of developing chronic dysmenorrhea. (medscape.com)
  • All three guidelines recommend routine screening mammography in asymptomatic, average-risk women aged 50 to 74, but differ with regard to frequency of screening. (medscape.com)
  • Gestational diabetes and risk of breast cancer before age 55 years. (who.int)
  • Despite of younger age it remains a risk factor for high incidence rates, the five-year survival lower survival worldwide4. (bvsalud.org)
  • Continuing with more recent trends, incidence rates increased by about 2% per year in women younger than 50 years and by 1% per year in women aged 50 years and older. (cancer.gov)
  • Factors predisposing individuals to early menarche and its consequences should be considered in chronic disease prevention strategies for adolescents and young adults . (bvsalud.org)
  • A direct correlation was found between the age of menarche of adolescents and that of their mother ( p p p = 0.001), but an indirect correlation was found with the girls' hip circumference ( p = 0.004). (scirp.org)
  • We demonstrated a clear secular tendency towards an earlier onset of menarche by comparing our results (11.9 ± 0.04) with data from 1985 (12.8 ± 1.3) for adolescents from the same city. (scirp.org)
  • However, adolescents although still in the "Pediatric" age group have their own "teen-specific" health and wellness concerns. (drpaul.com)
  • Father Absence and Early Family Composition as a Predictor of Menarcheal Onset: Psychosocial and Familial Factors That are Associated with Pubertal Timing. (etsu.edu)
  • This suggests that age at menarche may be less of a predictor of heart health as women age. (menopause.org.au)
  • This percentage of early menarche was higher than would be expected from historical controls in the general population, but was consistent with maternal age of menarche. (bmj.com)
  • The mean maternal age at the birth of their offspring was 25 years, while the mean maternal BMI was 20.5 kg/m 2 . (medscape.com)
  • Similar findings were seen for antisocial behavior, with younger age at onset of menarche associated significantly and linearly with a higher frequency of antisocial behavior. (contemporarypediatrics.com)
  • This new study involving more than 20,000 women not only found that increases in age at menarche are significantly associated with increases in heart health in women but also that there are major age differences in the association. (menopause.org.au)
  • Early menarche age, the status of current pregnancies, history of chronic hypertension, BMI, and alcohol consumption were significantly associated with preeclampsia. (bvsalud.org)
  • Multiple regression analysis and logistic regression were used to determine factors that were related to or predictive of age at menarche. (scirp.org)
  • Other hormonal-related factors include never having children, late childbearing (after the age of 30), and obesity, especially excessive weight gain in post-menopausal women. (singhealth.com.sg)
  • Using data from the National Survey of Family Growth on 1,928 males and 2,859 females aged 15-29, we examine individual characteristics, family background factors, and characteristics of first sexual relationships and partners associated with the transition to a first nonmarital birth. (cdc.gov)
  • Rates of nonmarital childbearing (measured as the number of births per 1,000 unmarried women) are highest among women in their early twenties.1 Thus, although an extensive research literature examines the transition to a first nonmarital birth among teens ¸ it is critical to examine factors associated with nonmarital childbearing past the teen years. (cdc.gov)
  • MS patients were a median age of 62.6, and survey data were cross-checked against Mayo Clinic medical records. (medpagetoday.com)
  • In total, 235,191 women with a mean age of 55.7 years were included in the study for a median follow-up of 11.6 years. (medpagetoday.com)
  • The early matures (menarche earlier than the mean age of 12.6 years) probably will grow more than the mean of 6 or 7cm, and for a longer period than the ones who are later matures until they reach their final height. (scielo.br)
  • In terms of age, girls who were low in vitamin D were about 11.8 years old when they started menstruating, compared to the other group at about age 12.6 years old. (umich.edu)
  • It may occur as early as age 9, or as late as age 16. (medlineplus.gov)
  • If you or your family members experienced early or late puberty, the odds of your child experiencing it around the same time are high. (yahoo.com)
  • Some girls start puberty at age 8, and others may start as late as 13 or 14. (kidshealth.org)
  • But it can be as early as age 8 or as late as 15. (kidshealth.org)
  • Some definitions start as early as 10 and end as late as 26. (wikipedia.org)
  • Although menarche is a late event in the puberal process, most parents do not realize until this moment that their daughters are no longer children. (scielo.br)
  • Similarly, the researchers found that the protective effects of late menarche on cardiovascular health were apparent in women aged 25 to 44 years, whereas the detrimental effects of early menarche were only observed in those aged 25 to 34 years. (menopause.org.au)
  • While precocious puberty is rare, more children nowadays are going through puberty at a younger age. (yahoo.com)
  • Given that more girls are entering puberty at a younger age, Mendle and colleagues highlight that a better understanding of the long-term psychosocial effects of early puberty are needed. (contemporarypediatrics.com)
  • Additionally, early childhood blood lead was negatively associated with pubic hair growth ( OR = 0.68, 95% CI: 0.51-0.90) in girls. (cdc.gov)
  • The literature tends to support milk's role in enhancing growth early in life (prior to age 5 years), but there is less support for this relationship during middle childhood. (nih.gov)
  • Some forms of CVD have their origins during childhood, which is one reason why they have been previously associated with early menarche. (menopause.org.au)
  • However, mortality among young people has decreased less than in other age groups, overtaking childhood mortality in some high-income countries. (who.int)
  • Therefore, being the transition between childhood and adult age, definite for the formation of the individual's personality This is an experience permeated by psychic spaces, of external and internal limits. (bvsalud.org)
  • Results indicted a significant difference in menarcheal age between those from homes where both biological parents were present and those where the biological father was absent before menarche. (etsu.edu)
  • There was a significant correlation between menarcheal age of mothers and their daughters ( r = 0.27). (who.int)
  • There is no correlation between age at the peak of height velocity and final height. (scielo.br)
  • Modern disease-modifying therapies also may affect findings, since the study group consisted of older patients who would have not received immunomodulation early in their disease course, Zeydan and colleagues noted. (medpagetoday.com)
  • Highlighting that these findings show that the magnitude of the association between puberty and depressive symptoms and antisocial behavior remain stable over time, Mendle underscored that psychological vulnerability of earlier puberty lingers longer than previously expected. (contemporarypediatrics.com)
  • So that 60 of each 1000 girls from 10 to 19 years of age become mothers, the equivalent to the birth of 17 million new born, on average, each year. (bvsalud.org)
  • Results are published in the article "Age at menarche and cardiovascular health: results from the NHANES 1999-2016. (menopause.org.au)
  • RHQ questions, target ages and skip patterns have changed periodically since NHANES 1999-2000. (cdc.gov)
  • Male pattern baldness (MPB) is a sex-limited, age-related, complex trait. (nature.com)
  • Pubic hair, armpit and leg hair usually begin to grow at about age 9 or 10, and reach adult patterns at about 13 to 14 years. (medlineplus.gov)
  • By age 17 or 18, their genitals are usually at their adult size and shape. (medlineplus.gov)
  • Pubic hair growth, as well as armpit, leg, chest, and facial hair, begins in boys at about age 12, and reaches adult patterns at about 17 to 18 years. (medlineplus.gov)
  • To examine the associations of age at menarche with development and duration of depressive symptoms and antisocial behaviors, Mendle and colleagues collected and analyzed data on 7802 female participants taken from the National Longitudinal Study of Adolescent to Adult Health (Add Health). (contemporarypediatrics.com)
  • Maternal uniparental disomy of chromosome 14, paternal deletions and loss of methylation at the intergenic differentially methylated region (IG-DMR) result in a human phenotype of low birth weight, hypotonia, early puberty and markedly short adult stature. (bmj.com)
  • Methods: Using status quo and retrospective methods, menarcheal, pubarcheal and telarcheal status of girls 8 - 17 years of age (n = 1093) were determined. (scirp.org)
  • Menarche before or after 12 years of age was associated with higher risks of AF compared with menarche at age 12. (medpagetoday.com)
  • Facial hair in males normally appears in a specific order during puberty: The first facial hair to appear tends to grow at the corners of the upper lip, typically between 14 and 17 years of age. (wikipedia.org)
  • Pediatrics by definition includes taking care of children up to 18 years of age. (drpaul.com)
  • RESULTS Menarche was reached before or at 11 years of age in 13.5% of this group of girls. (bmj.com)
  • Studies have shown that ideal cardiovascular health is prevalent in 50% of the US population at 10 years of age and declines to less than 10% by 50 years of age. (menopause.org.au)
  • In 2010, the International Year of Youth, there were 1822 million young people 10-24 years of age - representing one quarter of the world's population.2 Four out of five young people live in less developed countries, and represent up to one third of those countries' populations. (who.int)
  • The World Health Organization (WHO), in accordance with the Health Ministry (HM), defines as an adolescent the people who correspond to the 10 to 19 age group, and may be divided in two stages: 10 to 14 years of age and 15 to 19 years of age. (bvsalud.org)
  • Participants completed a survey consisting of 12 questions pertaining to their family environment before menarche. (etsu.edu)
  • Participants were asked to give their age at first menarche in years and months. (etsu.edu)
  • Female participants aged 12 years and older were eligible. (cdc.gov)
  • These changes resulted in an increase in the actual number of participants aged 40-59 years and a decrease in participants aged 12-19 years, as compared to previous cycles. (cdc.gov)
  • OBJECTIVE: To determine whether positive parenting practices are associated with less aggressive and delinquent behavior in early-maturing girls. (rand.org)
  • RESULTS: A total of 25% of girls could be reliably classified as early maturers. (rand.org)
  • Early-maturing girls may benefit from increased parental nurturance, communication, and knowledge. (rand.org)
  • Girls may begin to develop breast buds as early as 8 years old. (medlineplus.gov)
  • Girls growth spurt peaks around age 11.5 and slows around age 16. (medlineplus.gov)
  • The average age that a child reaches sexual maturity differs between the genders: Girls experience puberty between 8 and 13 years old and boys experience it between 9 and 14 years old, according to the National Institutes of Health . (yahoo.com)
  • A new study shows a spike in early puberty in girls during the onset of the pandemic, which disrupted healthy habits for many. (yahoo.com)
  • When you go back and look at the data from the U.S. and Europe, there's been a large decrease in the age that girls have their first period," Breidbart explains. (yahoo.com)
  • While type 1 diabetes has previously been associated with delaying puberty, a recent stud y found that boys and girls with diabetes are also trending toward early puberty onset. (yahoo.com)
  • The study found that the onset of menarche was about 12 years for most of the girls (31%) followed by age 13 (24%) and age 11 (19%), but ranged from 7 to 24 years. (contemporarypediatrics.com)
  • About 10% of girls reported age of menarche at age 10 or younger. (contemporarypediatrics.com)
  • It's sort of the tip of the iceberg," says Uitterlinden, who led one of four groups that identified several variations in a gene called LIN28B that affect the timing of girls' first period, or menarche. (newscientist.com)
  • Girls go through menarche between the ages of 9 and 16, and the variations in LIN28B accounted for just one to three months of these differences. (newscientist.com)
  • His team found a variant near the gene associated with earlier breast development in girls and, in boys, earlier voice-breaking. (newscientist.com)
  • For most girls this is around age 12. (kidshealth.org)
  • Researchers from the University of Michigan School of Public Health measured the blood vitamin D levels in 242 girls ages 5-12 from Bogota, Colombia, and followed them for 30 months. (umich.edu)
  • Previous research has suggested that menarche happens later in girls living closer to the Equator than girls living in northern countries. (umich.edu)
  • In the research by Villamor and colleagues, 57 percent of the girls in the vitamin D-deficient group reached menarche during the study, compared to 23 percent in the vitamin D-sufficient group. (umich.edu)
  • It's necessary to do more studies to show if interventions that change girls' vitamin D status result in a change in their age of menarche. (umich.edu)
  • Alcohol use starts at a young age: 14% of adolescent girls and 18% of boys aged 13-15 years in low- and middle-income countries are reported to use alcohol. (who.int)
  • This study aimed to assess the association of age at menarche (AAM) with multimorbidity and chronic diseases . (bvsalud.org)
  • The present study analyzes the effects of father absence situations that tend to result on the onset of menarche. (etsu.edu)
  • This study examined the secular trend of age at menarche among Iranian women. (who.int)
  • One study of the timing of puberty, conducted between 1977 to 2013, found that the age for breast development had decreased by three months per decade. (yahoo.com)
  • One new study suggests that age at menarche plays an important role in maintaining and improving cardiovascular health, although there are a number of age differences. (menopause.org.au)
  • LVVB: study conception, nivel especializado en la atención de la mujer. (bvsalud.org)
  • Women with one to three full pregnancies reached EDSS-6 at age 51.7, and women with four or more pregnancies reached EDSS- 6 at age 53.5 ( P =0.013). (medpagetoday.com)
  • 1 The hypothesis that endogenous estradiol is cardioprotective is used to support the finding that premenopausal women have lower rates of cardiovascular disease compared with men of the same age. (medpagetoday.com)
  • In fact, significant associations between age at menarche and ideal cardiovascular health were observed only in young women, whereas little association was documented in older women. (menopause.org.au)
  • We know that breast development is now starting before age 10 in the average girl," says Breidbart, "and overall, there's been a decrease of about two to three months per decade across the globe over the past 30 to 40 years. (yahoo.com)
  • This 10-month difference is substantial, Villamor said, because even though 10 months may not seem like a long time, at that age a lot is happening rapidly to a young girl's body. (umich.edu)
  • The children underwent health checks and anthropometric measurements at 1 to 2, 3, 6, 9, and 12 months during infancy, every 6 months until aged 36 months, and thereafter yearly until the ages of 6 to 7 years. (medscape.com)
  • A question used to calculate estimated time in months at menarche for youth 12-19 was added in 2017-2018. (cdc.gov)
  • RHD018: Estimated age in months at menarche was calculated using reported age at menarche, and month of menarche, as well as month and year of birth. (cdc.gov)
  • Lu and colleagues hypothesized that "reproductive life span function is potentially associated with AF development in women, induced by the long-lasting changes in estrogen levels related to aging. (medpagetoday.com)
  • 2 ] Age-adjusted endometrial cancer incidence in the United States increased from the mid-1960s to 1975 and then declined from 1975 to 1980, with a transient increase in incidence occurring from 1973 to 1978, which was associated with estrogen therapy, also known as hormone therapy. (cancer.gov)
  • Objective: To investigate the age at menarche, pubarche and telarche in a representative sample of residents of an urban zone of Leon, Guanajuato, Central Mexico and to evaluate the secular change of the age at menarche between 1985 and 2000. (scirp.org)
  • In particular, like most GWAS for other complex traits, previous GWAS for age at menarche provided poor coverage for low-frequency variants and omitted sex chromosome data. (nature.com)
  • Early maturation was associated with higher relational aggression only at low levels of nurturance (b = 0.94), communication (b = 1.36), and knowledge (b = 1.06) (P (rand.org)
  • Conclusion: We demonstrated a clear reduction in age at menarche of approximately 0.75 year/decade, higher than Tanner's finding in 1962, but similar than that of Malina et al . (scirp.org)
  • Year of birth, mother's menarcheal age and daughter's height were significant predictors of daughter's menarcheal age. (who.int)
  • ABSTRACT There is some evidence for a decreasing age of menarche in many populations. (who.int)
  • The life history stages include early growth and development, puberty, sexual development, reproductive career, and post-reproductive stage. (wikipedia.org)
  • They draw on classical life history theory, behavioral ecology, and reproductive ecology to make predictions about reproductive behavior and growth Analytical frameworks that explore problems relevant to reproductive ecology, such as age at menarche, or lactational amenorrhea, often employ understandings of energetics to their hypotheses and models. (wikipedia.org)
  • Boys' growth spurt peaks around age 13 and a half and slows around age 18. (medlineplus.gov)
  • The purpose of this review is to provide pediatricians with a means of making more accurate prognosis than populational means on growth after menarche for the adolescent girl, taking into account she has already had menarche. (scielo.br)
  • Their goal was to create "data-driven reference ranges that consider age, sex, ethnicity, disease status, and other relevant characteristics. (blogspot.com)
  • For each of the race/ethnicity domains, the former age domains 12-15 and 16-19 were combined and the age minority domain 40-59 was split into two 10-year age sampling domains: 40-49 and 50-59 years. (cdc.gov)
  • We identify plausible genetic correlations between MPB and multiple sex-limited markers of earlier puberty, increased bone mineral density ( r g = 0.15) and pancreatic β-cell function ( r g = 0.12). (nature.com)
  • 1% yielded no significant associations with age at menarche. (nature.com)
  • All four teams focused their hunts on gene variations found in at least 10 per cent of the population, while Stefánsson thinks that rarer variants may play a more significant role in menarche. (newscientist.com)
  • Results: This showed that the retinal changes observed in the preeclamptic women were associated with their age (P = 0.009), gestational age (P = 0.044), blood pressure (P = 0.001), Proteinuria (P = 0.001), Severity of the disease (P = 0.001), visual acuity (P = 0.035) as well as with the visual symptoms (P = 0.001) but not statistically significant with the gravida (P = 0.799). (bvsalud.org)
  • Early, prepubescent changes occur when the secondary sexual characteristics appear. (medlineplus.gov)
  • BMD changes that occur with increasing age are thought to be related to the decline in osteoblastic (bone formation) function (Mahan & Escott-Stomp, 2004). (unm.edu)
  • Precocious puberty is when signs of sexual maturity occur earlier than age 8 in a girl and age 9 in a boy. (yahoo.com)
  • Dr. Emily Breidbart , a pediatric endocrinologist and assistant professor in the department of pediatrics at NYU Langone Health, tells Yahoo Life that most precocious puberty cases occur a little before age 8 for a girl and around age 9 for a boy. (yahoo.com)
  • In 2003, 35% of all births and 42% of first births occurred to unmarried women,1 representing dramatic increases from earlier decades.2 Births to women in their teens and early twenties are more likely to occur outside of marriage than births to older women. (cdc.gov)
  • The women were divided into two groups of 110 pregnant women (A&B).Their Age and Gestational age was cross-matched and retinopathy graded according to Keith and Wagner classification. (bvsalud.org)