"Since 1858, an increase of mean stature has been observed in the
Netherlands, reflecting the improving nutritional, hygienic, and
health status of the population. In this study, stature, weight, and
pubertal development of Dutch youth, derived from four consecutive
nationwide cross-sectional growth studies during the past 42 y, are
compared to assess the size and rate of the secular growth change. ...
In girls, median age at menarche has decreased by 6 mo during the
past four decades to 13.15 y.
Fredriks AM, van Buuren S, Burgmeijer RJ, Meulmeester JF, Beuker RJ,
Brugman E, Roede MJ, Verloove-Vanhorick SP, Wit JM. Continuing
positive secular growth change in The Netherlands 1955-1997. Pediatr
Res. 2000 Mar;47(3):316-23.
Pubertal Development in The Netherlands 1965–1997
DICK MUL, A. MIRANDA FREDRIKS, STEF van BUUREN, WILMA OOSTDIJK, S. PAULINE VERLOOVE-VANHORICK, AND JAN MAARTEN WIT
We conclude that the secular change toward earlier puberty has been stabilized in the last two decades in The Netherlands. No change in the definition of precocious puberty is warranted. The occurrence of menarche is not only dependent on age, but
also on height, weight, and BMI. Beyond a weight or BMI of .0 SDS, this dependency is less apparent. The agreement between the expression of gonadal maturation and pubic hair is slightly higher in boys than in girls.