Temporal trends in preterm birth rate over the last 30 years in Sweden: a population-based study
This population-based study of over 3.2 million Swedish pregnancies reveals that while preterm birth rates remained stable from 1991 to 2005, they significantly declined from 2006 to 2021 due to a reduction in spontaneous preterm births, particularly among late and moderately preterm categories, despite the absence of a nationwide preventive strategy.