ArticleObstetrics and gynecology2020
Age-Dependent and Seasonal Changes in Menstrual Cycle Length and Body Temperature Based on Big Data.
Article in Obstetrics and gynecology, 2020. The graph could read no effect estimate from its abstract, so it casts no vote on the map. It is linked to trial NCT06996977 (The Effect of Menstrual Cycle on Postanesthetic Shivering; Prospective Observational Study), which is not on this map. Cited by 24 papers.
What it found
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
The trial behind it
Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.
The Effect of Menstrual Cycle on Postanesthetic Shivering; Prospective Observational Study
Who cites it
24 citing papers in PubMed, 45 citations in OpenAlex.
- Heat, menstruation, and mental health in adolescence and young adulthood: Understudied in climate-health research.Dialogues in health · 2026Review
- Evolutionary and physiological arguments for the existence of a circalunar clock in humans.BMC ecology and evolution · 2026Review
- Within-individual changes in BMI and menstrual irregularity: a cohort study using real-world data.BMC women's health · 2026Article
- From nighttime light exposure to menstrual health: a critical review of evidence, mechanisms, and nursing interventions.Frontiers in reproductive health · 2026Review
- Synchronization of women's menstruation with the Moon has decreased but remains detectable when gravitational pull is strong.Science advances · 2025Article
- Is sex at birth a biological coin toss? Insights from a longitudinal and GWAS analysis.Science advances · 2025Article
- A smartphone application as a promising tool for large-scale collection of participant data on fertility treatment.Scientific reports · 2025Article
- The Menstrual Cycle as a Vital Sign: a comprehensive review.F&S reviews · 2025Article
- Oura Ring as a Tool for Ovulation Detection: Validation Analysis.Journal of medical Internet research · 2025Article
- The impact of seasonal variations on IVF pregnancy outcomes: a retrospective cohort study in Jinan, China.Frontiers in medicine · 2025Article
- Menstrual variations of sleep-wake rhythms in healthy women.Sleep and biological rhythms · 2025Article
- Endocrine effects of heat exposure and relevance to climate change.Nature reviews. Endocrinology · 2024Review
- Coronary artery culprit lesions progression and ambient temperature exposure - personalised analysis.Postepy w kardiologii interwencyjnej = Advances in interventional cardiology · 2024Article
- Seasonal variations of menstrual cycle length in a large, US-based, digital cohort.International journal of hygiene and environmental health · 2024Article
- A molecular staging model for accurately dating the endometrial biopsy.Nature communications · 2023Article
- Using Hormone Data and Age to Pinpoint Cycle Day within the Menstrual Cycle.Medicina (Kaunas, Lithuania) · 2023Article
- Climate change and pregnancy complications: From hormones to the immune response.Frontiers in endocrinology · 2023Review
- Tracking of menstrual cycles and prediction of the fertile window via measurements of basal body temperature and heart rate as well as machine-learning algorithms.Reproductive biology and endocrinology : RB&E · 2022Observational
- Cognitive function evaluation in premenstrual syndrome during the follicular and luteal phases using near-infrared spectroscopy.Comprehensive psychoneuroendocrinology · 2022Article
- Impact of the Hormonal Status in Women on Intraoperative Hypothermia during Laparoscopic Gynecologic Surgery when Considering the Fresh Gas Flow Rate: A Retrospective Study.BioMed research international · 2022Article
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
10 authors at 1 institution in 3 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
objectiveTo evaluate the effects of age and season on menstrual cycle length and basal body temperature (BBT). We also examined the effects of climate on cycle length and BBT, taking into account Japanese geographic and social characteristics.
methodsIn this retrospective cohort study, we analyzed data from 6 million menstrual cycles entered into a smartphone application from 310,000 females from 2016 to 2017. Only those who entered more than 10 cycles in 2 years were included. Generalized estimation equations were used to adjust for confounding factors and for within-person correlations of multiple records. Multiple regression analysis was conducted, with age, external average temperature, precipitation amount, and sunshine hours as confounding factors.
resultsThe mean menstrual cycle length increased from age 15-23 years, subsequently decreased up to age 45 years, and then increased again. Average follicular phase body temperature showed no significant age-dependent changes, but luteal phase body temperature gradually increased up to 29 years and then stabilized and started to decrease after age 42 years. A significant association between external temperature and body temperature (follicular and luteal phase) was observed, though menstrual cycle length did not show such an association.
conclusionThese results, derived from data self-entered into a smartphone application, revealed underrecognized age-dependent and seasonal changes in menstrual cycle length and BBT, which will contribute to a better understanding of female reproductive health in the modern world.
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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.