Vitamin D Levels and Menstrual Cycle Length in 449 Women with PCOS

449 women diagnosed with polycystic ovary syndrome (PCOS) were stratified by vitamin D levels in this cross-sectional study. The prevalence of prolonged menstrual cycles was 87.2% in the low vitamin D group compared to 70% in the normal group. Author Lijing Wang published the findings on figshare under a CC-BY-4.0 license in May 2026.

Use Cases

• Assessing the association between vitamin D levels and menstrual cycle length based on the described stratification and regression analysis.
• Investigating non-linear relationships in clinical data based on the identified inflection point of 27.76 ng/mL.
• Training predictive models for prolonged menstrual cycles using features like BMI, fasting insulin, and total testosterone mentioned in the description.
• Conducting meta-analysis on PCOS and vitamin D by combining with other datasets.

Strengths

• Includes data from 449 participants, providing a substantial sample size for a clinical study.
• Reports specific, statistically significant findings, such as an 9% reduction in risk per 1 ng/mL increase in vitamin D.
• Defines clear clinical thresholds for vitamin D levels (<20 ng/mL vs. ≥20 ng/mL) and menstrual cycle length (>35 days).

Limitations

• Column-level documentation is absent; field semantics must be inferred after download.
• Row count is unknown, which may limit suitability assessment.
• The data is contained in a 17.8 KB DOCX file, suggesting limited scope and potentially summarized results rather than raw individual-level data.

Provenance

Source

figshare

Collection Method

Cross-sectional study involving clinical measurements of BMI, fasting plasma glucose, fasting insulin, and sex hormones.

Freshness

Last updated 2026-05-13 04:49:00; freshness should be verified.