Decrease in menarcheal age from 1966 to 1983 in Denmark.

@article{Helm1984DecreaseIM,
  title={Decrease in menarcheal age from 1966 to 1983 in Denmark.},
  author={Peter Helm and S B Helm},
  journal={Acta obstetricia et gynecologica Scandinavica},
  year={1984},
  volume={63 7},
  pages={633-5}
}
Mean age at menarche was estimated by the status quo method in the same region of Denmark in 1965-66 and 1982-83 in 983 and 1 591 girls, respectively. During that period menarcheal age decreased by 4 months from 13.40 to 13.03 years, subsequent to a similar decrease from 1949-50 (2) to 1965-66. Comparison with recent data from the other Nordic countries, except Norway, indicates that age at menarche is now close to 13 years, and a halt in the trend towards earlier menarche is not evident.