 This study found that women with lower educational levels are more likely to give birth prematurely than those with higher levels of education. Body mass index, BMI, appears to be an important mediator of this relationship, suggesting that obesity may contribute to the disparity in preterm birth rates between educated and uneducated women. Additionally, other factors such as smoking, drug use, preeclansia, and genitourinary infections appear to play a role in the observed inequality between women with different levels of education. Improving access to health care and health literacy programs, as well as providing preventative interventions before and during pregnancy, could help reduce preterm birth rates and perinatal health inequalities. This article was authored by Laura Graines, Isabel Torracamora, Monse Palacio, and others.