JECS: Maternal Hemoglobin and Placental Weight to Birthweight Ratio in 83,354 Singletons

83,354 singleton births from the Japan Environment and Children’s Study (JECS) form a cohort dataset analyzing associations between maternal hemoglobin concentration and placental weight, birthweight, and their ratio. The study, funded by Japan's Ministry of the Environment, applied regression analyses with restricted cubic splines to the data. It found a U-shaped relationship between maternal hemoglobin concentration and the placental weight to birthweight ratio.

Use Cases

• Modeling the relationship between maternal hemoglobin levels and placental weight based on the described regression analyses
• Investigating the U-shaped association between hemoglobin concentration and the placental weight to birthweight ratio
• Analyzing birthweight trends relative to maternal hemoglobin levels above and below 12 g/dl
• Studying the epidemiology of anemia during pregnancy in a large Japanese cohort

Strengths

• Data from a large cohort of 83,354 singleton births and their mothers
• Findings include specific hemoglobin concentration thresholds (e.g., 12 g/dl) and trends

Limitations

• Column-level documentation is absent; field semantics must be inferred after download
• Row count for the specific analysis is unknown, which may limit suitability assessment

Provenance

Source

Japan Environment and Children’s Study (JECS)

Collection Method

Cohort study applying regression analyses with restricted cubic splines

Geography

Japan