Researchers studied over 6.2 million individuals, 5.4% of which were born preterm, in Denmark, Finland, Norway and Sweden and found that the risk for all-cause mortality after age 15 was greater in those with moderate preterm birth, late preterm birth and early term birth, compared with full-term birth. The findings in JAMA Network Open also showed that preterm birth was linked to a twofold increased risk of death from chronic lung disease, diabetes and cardiovascular disease.