Secular trend in age at menarche in women in Portugal born between 1920 and 1992: Results from three population-based studies

Autores da FMUP

• Ana Cristina Correia Dos Santos

  Autor

• José Henrique Dias Pinto De Barros

  Autor

Participantes de fora da FMUP

• Queiroga, AC
• Silva, RS
• Maia, I

Unidades de investigação

• Ciências da Saúde Pública e Forenses, e Educação Médica

Abstract

Objectives Worldwide data on age at menarche suggest a gradually earlier maturation, which is stabilizing in some societies. The interplay between socioeconomic, behavioral, and environmental factors generates uncertainty about the current status and future trend of age at menarche in most societies. Therefore, we aimed to describe trends in age at menarche during the 20th century in Portugal. Methods A sample of 11 274 women born between 1920 and 1992 in northern Portugal, recruited to participate in three population-based cohorts (EPIPorto, EPITeen, and Generation XXI) was evaluated. Age at menarche across birth year categories was compared using ANOVA and the rate of change over time using linear regression. Results Age at menarche decreased with birth year (-31.1 days per 5 years;beta= -.017,P < .001), women born before 1930 having a significantly higher age at menarche than those who were born after 1990 (mean (SD) = 13.1 (1.83) vs 12.0 (1.25),P < .001). Conclusions The decrease in age at menarche in northern Portugal suggests that a plateau is yet to be reached. Attention to time trends in age at menarche is relevant for health promotion since there is a possible relationship between pubertal timing and the later development of the metabolic syndrome.

Keywords

• DETERMINANTS; PREVALENCE