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The aim of this study was to investigate the early age at menarche and its associated factors in school girls (age, 10\u201312\u2009years) in Rajshahi District, Bangladesh.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Methods<\/jats:title>\n                <jats:p>Data was collected from Rajshahi District, Bangladesh, using multistage random sampling. Independent sample <jats:italic>t<\/jats:italic> test and binary logistic regression model were used in this study. A total number of 386 school girls aged 10\u201312\u2009years were considered as a sample for this study.<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Results<\/jats:title>\n                <jats:p>This study revealed that more than 48% girls already attained menarche within the age of 12\u2009years, among them 25.6%, 41.0%, and 58.3% girls experienced menarche at the age of 10, 11, and 12\u2009years, respectively. It was observed that the menarcheal girls were significantly taller (<jats:italic>p<\/jats:italic> &lt; 0.01) and heavier (<jats:italic>p<\/jats:italic> &lt; 0.01) than non-menarcheal girls. The menarcheal girls\u2019 mothers were heavier (<jats:italic>p<\/jats:italic> &lt; 0.01), shorter (<jats:italic>p<\/jats:italic> &lt; 0.01), had more BMI (<jats:italic>p<\/jats:italic> &lt; 0.01), reached menarche (<jats:italic>p<\/jats:italic> &lt; 0.05) earlier than non-menarcheal girls\u2019 mothers. Menarcheal girls had less number of siblings (<jats:italic>p<\/jats:italic> &lt; 0.01) and lower order of birth (<jats:italic>p<\/jats:italic> &lt; 0.05) than non-menarcheal girls. After controlling the effect of other factors, multiple logistic regression model demonstrated that obese girls were more likely to attain menarche than under- [AOR = 0.279, CI 95% 0.075\u20130.986; <jats:italic>p<\/jats:italic> &lt; 0.05] and normal [AOR = 0.248, CI 95% 0.082\u20130.755; <jats:italic>p<\/jats:italic> &lt; 0.05] weight girls. Urban school girls had more chance to get menarche than rural school girls at same age (AOR = 0.012, 95% CI 0.003\u20130.047; <jats:italic>p<\/jats:italic> &lt; 0.01).<\/jats:p>\n              <\/jats:sec><jats:sec>\n                <jats:title>Conclusions<\/jats:title>\n                <jats:p>Therefore, modern lifestyle changes may have the important factors for early age at menarche of the studied girls in Bangladesh.<\/jats:p>\n              <\/jats:sec>","DOI":"10.1186\/s40101-020-00218-w","type":"journal-article","created":{"date-parts":[[2020,3,24]],"date-time":"2020-03-24T02:03:32Z","timestamp":1585015412000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Early age at menarche and its associated factors in school girls (age, 10 to 12\u2009years) in Bangladesh: a cross-section survey in Rajshahi District, Bangladesh"],"prefix":"10.1186","volume":"39","author":[{"given":"Jannatul Maowa","family":"Malitha","sequence":"first","affiliation":[],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Md. 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