Association of body composition and age at menarche in girls and adolescents in the Brazilian Legal Amazon.

J Pediatr (Rio J) · 2020 · PMC9432113 · PMID 30576629

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a decreasing trendno p-value reported

13 Similarly, a decreasing trend in age at menarche has been observed for the past 20 years in countries in the Americas, Europe, and Asia. 16 , 17 In the United States, Anderson et al. 18 investigated changes in age at menarche, showing that the mean age for this event in American girls decreased from 12.75 to 12.54 over a 20-year period.

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