Table 3 Additional Information Desirable for Optimal Dataset for "-Omics" Studies on Preterm Birth

• Demographic

○ Socioeconomic status, maternal education

• Clinical

○ Spontaneous onset vs. induced labor

• Maternal

○ Body mass index (BMI), nutritional status, weight gain, uterine anomaly, psychological stress, medications, uterine or cervical surgery, mode of conception, infection, pre-existing medical conditions, pregnancy complications

• Fetal

○ Birth weight, anomalies, infection

• Placental histopathology

• Family history

○ History of preterm birth, maternal gestational age at delivery