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Federación Mexicana de Ginecología y Obstetricia, A.C.

2024, Number 09

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Ginecol Obstet Mex 2024; 92 (09)

Secular changes in onset of menarche among Mexican women

Robellada ZCM, Zapata CCA, Morales HFV, Flores RCM, Roque SAM, Kably AA

Language: Spanish
References: 25
Page: 359-363
PDF size: 342.73 Kb.


ABSTRACT

Objective: To determine whether the age at menarche in Mexican women has decreased over the decades.
Materials and Methods: Observational, retrospective, multicenter study conducted on patients seen between 1977-2021 at the Instituto Nacional de Perinatología Isidro Espinosa de los Reyes and 2022-2023 at the Centro Especializado para la Atención de la Mujer. For the purposes of the study, the participants were divided into five groups according to the decade of their birth (A: 1920-1969, B: 1970-1979, C: 1980-1989, D: 1990-1999, E: 2000-2009). A simple linear regression analysis using ANOVA was performed to evaluate differences in the trend of age at menarche. A value of p ‹ 0.05 was considered significant.
Results: A total of 20,715 patients were included in the final analysis. The overall mean age at onset of menarche was 12.0 years (± 1.62). There was a statistically significant difference in mean age at menarche between the decade groups (p = 0.0001). In linear regression, a statistically significant trend of decreasing age at onset of menarche was observed with increasing decade.
Conclusions: We found a significant decrease in age at menarche over the decades of 1.35 months for each decade elapsed. This change may have several implications for public health and gynecological care. The results highlight the need for future studies to investigate the specific causes of this trend and its possible long-term consequences.


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