Trends in Puberty Timing in Danish Children
Author Information
Author(s): Aksglaede Lise, Olsen Lina W., Sørensen Thorkild I. A., Juul Anders
Primary Institution: University Department of Growth and Reproduction, Rigshospitalet, Copenhagen, Denmark
Hypothesis
The study aims to determine if the age at onset of pubertal growth spurt and peak height velocity during puberty show secular trends over four decades in a large cohort of school children.
Conclusion
The study found a significant decline in the age at onset of pubertal growth spurt and peak height velocity, indicating a trend towards earlier sexual maturation in Danish children born between 1930 and 1969.
Supporting Evidence
- Age at onset of pubertal growth spurt declined by 0.2 years in girls and 0.4 years in boys.
- Age at peak height velocity declined by 0.5 years in girls and 0.3 years in boys.
- The duration of puberty increased slightly in boys but decreased in girls.
Takeaway
Kids today are growing up faster than they did a long time ago, reaching puberty earlier than kids born in the past.
Methodology
The study analyzed annual height measurements from school health records of children born between 1930 and 1969 in Copenhagen to determine the ages at onset of growth spurt and peak height velocity.
Potential Biases
Potential selection bias due to the exclusion of boys who left school before age 15, which may have affected the number of boys included in the analysis.
Limitations
The study lacks detailed information on health status or nutrition for each child, and the analysis was limited to children with sufficient height measurements.
Participant Demographics
The study included 135,223 girls and 21,612 boys born between 1930 and 1969.
Statistical Information
P-Value
p<0.0001
Confidence Interval
(1.98–2.05)
Statistical Significance
p<0.0001
Digital Object Identifier (DOI)
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