Timing of puberty in boys and girls: A population‐based study

Paediatric and Perinatal Epidemiology - Tập 33 Số 1 - Trang 70-78 - 2019
Nis Brix1,2, Andreas Ernst1,2, Lea Lykke Harrits Lunddorf2, Erik Thorlund Parner3, Henrik Støvring3, Jørn Olsen4,1, Tine Brink Henriksen5, Cecilia Høst Ramlau‐Hansen2
1Department of Epidemiology, Fielding School of Public Health, University of California, Los Angeles, California, USA
2Department of Public Health, Section for Epidemiology, Aarhus University, Aarhus, Denmark
3Department of Public Health, Section for Biostatistics, Aarhus University, Aarhus, Denmark
4Department of Clinical Epidemiology, Aarhus University Hospital, Aarhus, Denmark
5Perinatal Epidemiology Research Unit, Department of Paediatrics, Aarhus University Hospital, Aarhus, Denmark

Tóm tắt

AbstractBackgroundA secular trend towards earlier puberty has been observed in girls, while a similar trend has been more uncertain in boys. We estimated current ages at pubertal development in both boys and girls.MethodsIn this population‐based cohort study, 14 759 of 22 439 invited boys and girls born from 2000 to 2003 in the Danish National Birth Cohort gave half‐yearly self‐reported information on puberty from the age of 11.5 years and throughout puberty. This late start of follow‐up limits the estimation of age at onset of puberty but not later pubertal milestones. We estimated mean age at attaining the following pubertal milestones in years with 95% confidence intervals (CI): age at menarche, voice break, first ejaculation of semen and Tanner stages for pubic hair development and breast development or genital development. Further, the difference in mean age at menarche between mothers and daughters was estimated.ResultsIn boys, voice break occurred at 13.1 (95% CI 13.0, 13.1) years, first ejaculation of semen occurred at 13.4 (95% CI 13.3, 13.4) years, and Tanner Genital Stage 5 occurred at 15.6 (95% CI 15.5, 15.6) years. In girls, age at menarche occurred at 13.0 (95% CI 13.0, 13.1) years and Tanner Breast Stage 5 occurred at 15.8 (95% CI 15.7, 15.9) years. Daughters had menarche 3.6 (95% CI 3.1, 4.2) months earlier than their mothers had.ConclusionThese data indicate that age at menarche has declined and to some extent support a decline in age at attaining other markers of pubertal development among boys.

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Paediatric and Perinatal Epidemiology

Tập 33 Số 1

70-78

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