Study Links Neighborhood Disadvantage to Increased Menstrual Disturbances in Preconception Women
A new study finds that women living in more disadvantaged neighborhoods experience higher rates of menstrual disturbances, particularly dysmenorrhea, even after accounting for individual socioeconomic factors.
A recent study published in *Fertility and Sterility* reveals a significant association between neighborhood socioeconomic disadvantage and menstrual disturbances among women in a preconception cohort. Researchers analyzed data from 8,198 participants in the Pregnancy Study Online, an internet-based study conducted between October 2014 and September 2024. The findings suggest that living in more disadvantaged neighborhoods is linked to a higher prevalence of abnormal uterine bleeding and dysmenorrhea, even after adjusting for individual factors like age, race, and household income.
## Study Design and Methodology
The study focused on women aged 21-39 who were U.S. residents and not using contraceptives or fertility treatments. Researchers used the Area Deprivation Index (ADI) to measure neighborhood disadvantage, linking it to participants' residential addresses by block group and year. The study defined menstrual disturbances as:
- **Abnormal uterine bleeding**: irregular cycles, duration of flow ≥7 days, heavy bleeding, or cycle length <24 or >38 days. - **Dysmenorrhea**: severe pain requiring medication use and bed rest.
Participants self-reported their menstrual cycle characteristics, and researchers used modified Poisson regression models to estimate prevalence ratios (PR) and 95% confidence intervals (CI) for associations between ADI quartiles and menstrual disturbances.
## Key Findings
The study found that women in the most disadvantaged neighborhoods (Q4) had a higher prevalence of both abnormal uterine bleeding and dysmenorrhea compared to those in the least disadvantaged neighborhoods (Q1). The adjusted prevalence ratios were:
| Menstrual Disturbance | Q4 vs. Q1 (PR) | 95% CI | |---|---|---| | Abnormal uterine bleeding | 1.16 | 1.05, 1.29 | | Dysmenorrhea | 1.44 | 1.12, 1.85 |
After further adjustment for household income, the association between neighborhood disadvantage and abnormal uterine bleeding was no longer significant (PR = 0.99, 95% CI: 0.89, 1.10). However, the association with dysmenorrhea remained, showing a non-monotonic pattern across ADI quartiles:
| ADI Quartile | Dysmenorrhea (PR) | 95% CI | |---|---|---| | Q2 | 1.40 | 1.13, 1.74 | | Q3 | 1.42 | 1.13, 1.77 | | Q4 | 1.21 | 0.93, 1.56 |
## Implications and Conclusion
The study highlights the impact of neighborhood-level socioeconomic factors on menstrual health, particularly dysmenorrhea. While individual household income partially explained the association with abnormal uterine bleeding, neighborhood disadvantage remained a significant factor for dysmenorrhea. The researchers suggest that broader social and environmental factors in disadvantaged neighborhoods may contribute to these health disparities.
The findings underscore the need for further research into the mechanisms linking neighborhood disadvantage to menstrual disturbances and the development of interventions to address these disparities. The study was supported by grants from the National Institutes of Health and involved researchers from Boston University School of Public Health and other institutions.
