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Factors affecting menstrual cycle characteristics.

Yan Liu1, Ellen B Gold, Bill L Lasley

  • 1Center for Family Studies, Department of Psychiatry and Behavioral Sciences, School of Medicine, University of Miami, Miami, FL 33136, USA. yliu@med.miami.edu

American Journal of Epidemiology
|July 6, 2004
PubMed
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This study found that older age, alcohol consumption, and ethnicity influence menstrual cycle length. Lifestyle factors and immutable characteristics are linked to menstrual cycle variations, potentially impacting disease risk.

Area of Science:

  • Reproductive endocrinology
  • Epidemiology
  • Biostatistics

Background:

  • Menstrual cycle characteristics are influenced by various factors.
  • Understanding these influences is crucial for reproductive health and disease risk assessment.

Purpose of the Study:

  • To examine associations between risk factors and menstrual cycle characteristics.
  • To assess the impact of age, lifestyle, and ethnicity on menstrual cycle length and phase duration.

Main Methods:

  • Daily urinary estrogen and progesterone metabolites were analyzed using computer algorithms to determine ovulatory status and ovulation day.
  • Linear mixed models were employed to analyze menstrual cycle outcomes in 309 working women (aged 20-44) over a median of five cycles.
  • Data collected between 1989-1991 in California and Utah.

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Main Results:

  • Women aged 35+ had significantly shorter mean cycle lengths (-0.94 days) compared to younger women.
  • Asian women exhibited significantly longer mean cycle lengths (1.65 days) than Caucasian women.
  • Alcohol consumption was associated with significantly shorter mean cycle lengths (-1.26 days).
  • Age modified the effects of smoking, physical activity, ethnicity, and alcohol on follicular phase length.
  • Mean cycle and phase lengths correlated with prior luteal phase length.

Conclusions:

  • Potentially modifiable risk factors (e.g., alcohol consumption, smoking) and immutable factors (e.g., age, ethnicity) are associated with menstrual cycle characteristics.
  • These menstrual cycle variations may be linked to subsequent disease risk.
  • Further research is warranted to elucidate the complex interplay of these factors and their long-term health implications.