The interplay between variations of menstrual cycle length and age, ethnicity, and body weight npjDigitalMed HarvardChanSPH menstrualcycle menstrual period periodhealth menstrualhealth publichealth womenshealth
By Dr. Liji Thomas, MDMay 31 2023Reviewed by Lily Ramsey, LLM Menstrual health is fundamental to women's health. The length of menstrual cycles often indicates abnormalities in this area of women's health, but not enough is known about physiological differences in this parameter.
However, there were few reports on the association of obesity with cycle length, especially after ruling out confounding factors such as ethnicity, diet, and physical activity. About 5% of women had long cycles, and ~10% had short cycles. The findings of this study showed that age, obesity, and ethnicity were the three most significant contributors to differences in the mean cycle length.
Asian and Hispanic women were at 40% and 26% higher risk for long cycles than White women. Asian and Hispanic women also tended to have more variable cycle lengths, about 10% higher than White women. The link between obesity and longer cycles was most evident in White and Hispanic women, especially the latter, but became apparent in Black women only when examining the 75th percentile. Interestingly, Asian women did not show this association.
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