Cohort Study | Association of preterm birth with increased asthma and COPD risk in adulthood

Summary: This population-based register study investigated the correlation between gestational ages (GA) and obstructive airway diseases like asthma and chronic obstructive pulmonary disease (COPD) in adulthood. The study used registry data from 706,717 individuals born between 1987-1998 in Finland (4.8% preterm), and 1,669,528 individuals born from 1967-1999 in Norway (5.0% preterm). The study observed care episodes of asthma and COPD using nationwide healthcare registers.

The results showed an increased risk of obstructive airway disease in adulthood for those born at <28 or 28–31 completed weeks of gestation. Even after adjustments, the risk remained 2-3 times greater compared to those who were born full term (at 39-41 completed weeks). Additionally, the risk for COPD at age 30–50 was significantly higher for those born at <28 weeks, with an odds ratio (OR) of 7.44. The study also identified that bronchopulmonary dysplasia (BPD) in infancy increased the odds of obstructive airway disease for those born at <28 and 28–31 weeks.

These findings suggest that preterm birth is a notable risk factor for asthma and COPD in adulthood, and this risk was observed across all gestational ages before full term. The study recommends diagnostic vigilance for adults born very preterm presenting with respiratory symptoms. However, the researchers also noted the potential limitations of using registry data, which might include residual confounding from unmeasured confounders and lack of data on certain prenatal or early life factors.

Article: Preterm birth and asthma and COPD in adulthood: a nationwide register study from two Nordic countries – European Respiratory Journal (free for a limited period)

Commentary on Twitter

In this population-based study of 2.4 million people from Finland and Norway, adults born preterm were at higher risk for asthma and COPD at ages 18–50 years. The risks were observed across all gestational ages before full term in a dose-response manner. https://t.co/bGsAOrwAxV pic.twitter.com/WmCoc6cPu2

— ERS publications (@ERSpublications) June 22, 2023