Long-term health outcomes of early menarche in women: an umbrella review.
Level 2 - randomized trial
Umbrella review synthesizing systematic reviews and meta-analyses of observational cohort and case-control studies.
PubMed 35929081 · doi:10.1093/qjmed/hcac187
What was done
This umbrella review searched six databases (PubMed, Web of Science, Embase, CINAHL, Cochrane Database of Systematic Reviews, and Google Scholar) from inception to July 2021 to synthesize systematic reviews and meta-analyses examining the long-term adult health consequences of early menarche (defined adjusting for ethnicity and birth year). The authors evaluated the magnitude and GRADE certainty of reported associations.
What was found
The review included 13 systematic reviews encompassing 283 original articles and >6.8 million participants from 39 countries. Early menarche was significantly associated with: - High certainty: metabolic syndrome (pooled adjusted relative risk [aRR] 1.56, 95% CI 1.33–1.83; n = 37,543), endometrial cancer (aRR 1.40, 95% CI 1.17–1.68; n = 874,188), type 2 diabetes mellitus/impaired glucose tolerance (aRR 1.30, 95% CI 1.19–1.42; n = 1,185,444), breast cancer (aRR 1.19, 95% CI 1.06–1.33; n = 103,574), and all-cause mortality (aRR 1.11, 95% CI 1.03–1.19; n = 152,747). - Moderate certainty: obesity (aRR 1.68, 95% CI 1.53–1.84; n = 54,006), gestational diabetes mellitus (aRR 1.32, 95% CI 1.09–1.58; n = 48,535), hypertension (aRR 1.24, 95% CI 1.20–1.29; n = 1,682,689), endometriosis (aRR 1.22, 95% CI 1.09–1.37; n = 885,390), ovarian cancer (aRR 1.17, 95% CI 1.04–1.31; n = 1,022,451), adult BMI <40 years (adjusted standardized mean difference [aSMD] 0.39, 95% CI 0.36–0.43; n = 124,728), adult BMI ≥40 years (aSMD 0.30, 95% CI 0.28–0.32; n = 121,943), fasting insulin (aSMD 0.52, 95% CI 0.48–0.57; n = 17,020), and HOMA-IR (aSMD 0.27, 95% CI 0.19–0.35; n = 7,925). - Low certainty: asthma (aRR 1.31, 95% CI 1.09–1.57; n = 22,859).
Why it matters
This review synthesizes large-scale epidemiological evidence confirming that early menarche is a consistent marker for adult cardiometabolic disorders, female-specific malignancies, and increased all-cause mortality.
Limits
All included evidence is based on observational studies, which cannot establish causality. The abstract does not detail whether primary studies adequately adjusted for key early-life confounders such as childhood BMI or socioeconomic status, nor does it address primary study overlap among the included systematic reviews.
Cited by
- supports For girls, earlier onset of puberty predicts increased risk for mental health issues, physical health problems, earlier menopause, and a shorter lifespan.