Association of Social Determinants of Health, Race and Ethnicity, and Age of Menarche among US Women Over 2 Decades.

Introduction: Age of menarche (AOM), or the first menstrual cycle, is one indicator of female puberty. The timing of AOM can be influenced by social determinants of health (SDOH). This study examined associations between SDOH and AOM over the past 2 decades in the United States.

Methods: US National Health and Nutrition Examination Survey data (1999 to early 2020) were analyzed. Multinomial logistic regression analyses examined associations between AOM (early [11.99 years and younger], typical [12-13 years], and late [13.01 years and older]) and race/ethnicity, insurance coverage, education, family income-to-poverty ratio, money management, and home status.

Results: AOM remained consistent over the past 2 decades (mean 12.50 years, SE 0.02) for the aggregate sample. Females identifying as Hispanic (excluding Mexican Americans) were 63% more likely (adjusted odds ratio [aOR] 1.63, 95% confidence interval [CI] 1.13-2.36) to report early menarche. Those identifying as other/multiracial were 46% more likely to report late menarche (aOR 1.46, 95% CI 1.13-1.89) vs non-Hispanic Whites. Financial and home status instability was associated with early menarche (aOR 1.46, 95% CI 1.17-1.83; aOR 1.25, 95% CI 1.05-1.48). Less than 9th-grade education was associated with late menarche (aOR 1.47, 95% CI 1.14-1.89).

Conclusion: Although the average AOM has remained stable in the United States over the past 20 years, identifying as Hispanic (excluding Mexican Americans) and financial/home instability are associated with early AOM, and lower education levels are associated with late AOM. Identifying programming and policy options targeting SDOH may help improve current and future reproductive health.