Menstrual patterns in adolescent Swiss girls: a longitudinal study

Area of Science:

• Reproductive Endocrinology
• Adolescent Gynecology
• Longitudinal Cohort Studies

Background:

• Understanding adolescent menstrual cycle development is crucial for reproductive health.
• Longitudinal data on menstrual patterns in adolescence is limited.
• Menarcheal age and menstrual characteristics can be influenced by genetic and environmental factors.

Purpose of the Study:

• To longitudinally analyze menstrual cycle patterns in adolescent girls.
• To investigate changes in cycle length, flow duration, and intensity post-menarche.
• To explore correlations between maternal and daughter menarcheal ages.

Main Methods:

• Longitudinal study of 140 adolescent Swiss girls.
• Data collection on menstrual cycle length, duration, and intensity over six years post-menarche.
• Statistical analysis to determine mean values, standard deviations, and correlations.

Main Results:

• Mean cycle length stabilized around 29.9 days by the sixth post-menarcheal year (age 20).
• Cycle length and menstrual flow duration showed minimal changes after the first year.
• Maternal and daughter menarcheal ages were significantly correlated (r = 0.29, P < 0.001).

Conclusions:

• Menstrual cycle length and flow duration in adolescent girls tend to stabilize within six years of menarche.
• Menstrual characteristics show a familial correlation, suggesting a genetic component.
• The study provides valuable insights into normal menstrual development during adolescence.